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txn_btree.cc
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#include <unistd.h>
#include <limits>
#include <memory>
#include <atomic>
#include <mutex>
#include "txn.h"
#include "txn_proto2_impl.h"
#include "txn_btree.h"
#include "typed_txn_btree.h"
#include "thread.h"
#include "util.h"
#include "macros.h"
#include "tuple.h"
#include "record/encoder.h"
#include "record/inline_str.h"
#include "scopedperf.hh"
#define HAVE_REVERSE_RANGE_SCANS
using namespace std;
using namespace util;
uint64_t initial_timestamp;
struct test_callback_ctr {
test_callback_ctr(size_t *ctr) : ctr(ctr) {}
inline bool
operator()(const concurrent_btree::string_type &k, const string &v) const
{
(*ctr)++;
return true;
}
size_t *const ctr;
};
// all combinations of txn flags to test
static uint64_t TxnFlags[] = { 0, transaction_base::TXN_FLAG_LOW_LEVEL_SCAN };
template <typename P>
static void
always_assert_cond_in_txn(
const P &t, bool cond,
const char *condstr, const char *func,
const char *filename, int lineno)
{
if (likely(cond))
return;
static mutex g_report_lock;
std::lock_guard<mutex> guard(g_report_lock);
cerr << func << " (" << filename << ":" << lineno << ") - Condition `"
<< condstr << "' failed!" << endl;
t.dump_debug_info();
sleep(1); // XXX(stephentu): give time for debug dump to reach console
// why doesn't flushing solve this?
abort();
}
#define ALWAYS_ASSERT_COND_IN_TXN(t, cond) \
always_assert_cond_in_txn(t, cond, #cond, __PRETTY_FUNCTION__, __FILE__, __LINE__)
template <typename P>
static inline void
AssertSuccessfulCommit(P &t)
{
ALWAYS_ASSERT_COND_IN_TXN(t, t.commit(false));
}
template <typename P>
static inline void
AssertFailedCommit(P &t)
{
ALWAYS_ASSERT_COND_IN_TXN(t, !t.commit(false));
}
template <typename T>
inline void
AssertByteEquality(const T &t, const uint8_t * v, size_t sz)
{
ALWAYS_ASSERT(sizeof(T) == sz);
bool success = memcmp(&t, v, sz) == 0;
if (!success) {
cerr << "expecting: " << hexify(string((const char *) &t, sizeof(T))) << endl;
cerr << "got : " << hexify(string((const char *) v, sz)) << endl;
ALWAYS_ASSERT(false);
}
}
template <typename T>
inline void
AssertByteEquality(const T &t, const string &v)
{
AssertByteEquality(t, (const uint8_t *) v.data(), v.size());
}
struct rec {
rec() : v() {}
rec(uint64_t v) : v(v) {}
uint64_t v;
};
static inline ostream &
operator<<(ostream &o, const rec &r)
{
o << "[rec=" << r.v << "]";
return o;
}
template <template <typename> class TxnType, typename Traits>
static void
test1()
{
for (size_t txn_flags_idx = 0;
txn_flags_idx < ARRAY_NELEMS(TxnFlags);
txn_flags_idx++) {
const uint64_t txn_flags = TxnFlags[txn_flags_idx];
VERBOSE(cerr << "Testing with flags=0x" << hexify(txn_flags) << endl);
txn_btree<TxnType> btr(sizeof(rec));
typename Traits::StringAllocator arena;
{
TxnType<Traits> t(txn_flags, arena);
string v;
ALWAYS_ASSERT_COND_IN_TXN(t, !btr.search(t, u64_varkey(0), v));
btr.insert_object(t, u64_varkey(0), rec(0));
ALWAYS_ASSERT_COND_IN_TXN(t, btr.search(t, u64_varkey(0), v));
ALWAYS_ASSERT_COND_IN_TXN(t, !v.empty());
AssertByteEquality(rec(0), v);
AssertSuccessfulCommit(t);
VERBOSE(cerr << "------" << endl);
}
{
TxnType<Traits>
t0(txn_flags, arena), t1(txn_flags, arena);
string v0, v1;
ALWAYS_ASSERT_COND_IN_TXN(t0, btr.search(t0, u64_varkey(0), v0));
ALWAYS_ASSERT_COND_IN_TXN(t0, !v0.empty());
AssertByteEquality(rec(0), v0);
btr.insert_object(t0, u64_varkey(0), rec(1));
ALWAYS_ASSERT_COND_IN_TXN(t1, btr.search(t1, u64_varkey(0), v1));
ALWAYS_ASSERT_COND_IN_TXN(t1, !v1.empty());
if (t1.is_snapshot())
// we don't read-uncommitted for consistent snapshot
AssertByteEquality(rec(0), v1);
AssertSuccessfulCommit(t0);
try {
t1.commit(true);
// if we have a consistent snapshot, then this txn should not abort
ALWAYS_ASSERT_COND_IN_TXN(t1, t1.is_snapshot());
} catch (transaction_abort_exception &e) {
// if we dont have a snapshot, then we expect an abort
ALWAYS_ASSERT_COND_IN_TXN(t1, !t1.is_snapshot());
}
VERBOSE(cerr << "------" << endl);
}
{
// racy insert
TxnType<Traits>
t0(txn_flags, arena), t1(txn_flags, arena);
string v0, v1;
ALWAYS_ASSERT_COND_IN_TXN(t0, btr.search(t0, u64_varkey(0), v0));
ALWAYS_ASSERT_COND_IN_TXN(t0, !v0.empty());
AssertByteEquality(rec(1), v0);
btr.insert_object(t0, u64_varkey(0), rec(2));
ALWAYS_ASSERT_COND_IN_TXN(t1, btr.search(t1, u64_varkey(0), v1));
ALWAYS_ASSERT_COND_IN_TXN(t1, !v1.empty());
// our API allows v1 to be a dirty read though (t1 will abort)
btr.insert_object(t1, u64_varkey(0), rec(3));
AssertSuccessfulCommit(t0);
AssertFailedCommit(t1);
VERBOSE(cerr << "------" << endl);
}
{
// racy scan
TxnType<Traits>
t0(txn_flags, arena), t1(txn_flags, arena);
const u64_varkey vend(5);
size_t ctr = 0;
test_callback_ctr cb(&ctr);
btr.search_range(t0, u64_varkey(1), &vend, cb);
ALWAYS_ASSERT_COND_IN_TXN(t0, ctr == 0);
btr.insert_object(t1, u64_varkey(2), rec(4));
AssertSuccessfulCommit(t1);
btr.insert_object(t0, u64_varkey(0), rec(0));
AssertFailedCommit(t0);
VERBOSE(cerr << "------" << endl);
}
{
TxnType<Traits> t(txn_flags, arena);
const u64_varkey vend(20);
size_t ctr = 0;
test_callback_ctr cb(&ctr);
btr.search_range(t, u64_varkey(10), &vend, cb);
ALWAYS_ASSERT_COND_IN_TXN(t, ctr == 0);
btr.insert_object(t, u64_varkey(15), rec(5));
AssertSuccessfulCommit(t);
VERBOSE(cerr << "------" << endl);
}
txn_epoch_sync<TxnType>::sync();
txn_epoch_sync<TxnType>::finish();
}
}
struct bufrec { char buf[256]; };
template <template <typename> class TxnType, typename Traits>
static void
test2()
{
for (size_t txn_flags_idx = 0;
txn_flags_idx < ARRAY_NELEMS(TxnFlags);
txn_flags_idx++) {
const uint64_t txn_flags = TxnFlags[txn_flags_idx];
txn_btree<TxnType> btr(sizeof(bufrec));
typename Traits::StringAllocator arena;
bufrec r;
NDB_MEMSET(r.buf, 'a', ARRAY_NELEMS(r.buf));
for (size_t i = 0; i < 100; i++) {
TxnType<Traits> t(txn_flags, arena);
btr.insert_object(t, u64_varkey(i), r);
AssertSuccessfulCommit(t);
}
for (size_t i = 0; i < 100; i++) {
TxnType<Traits> t(txn_flags, arena);
string v;
ALWAYS_ASSERT_COND_IN_TXN(t, btr.search(t, u64_varkey(i), v));
AssertByteEquality(r, v);
AssertSuccessfulCommit(t);
}
txn_epoch_sync<TxnType>::sync();
txn_epoch_sync<TxnType>::finish();
}
}
template <template <typename> class TxnType, typename Traits>
static void
test_absent_key_race()
{
for (size_t txn_flags_idx = 0;
txn_flags_idx < ARRAY_NELEMS(TxnFlags);
txn_flags_idx++) {
const uint64_t txn_flags = TxnFlags[txn_flags_idx];
txn_btree<TxnType> btr;
typename Traits::StringAllocator arena;
{
TxnType<Traits>
t0(txn_flags, arena), t1(txn_flags, arena);
string v0, v1;
ALWAYS_ASSERT_COND_IN_TXN(t0, !btr.search(t0, u64_varkey(0), v0));
ALWAYS_ASSERT_COND_IN_TXN(t1, !btr.search(t1, u64_varkey(0), v1));
// t0 does a write
btr.insert_object(t0, u64_varkey(0), rec(1));
// t1 does a write
btr.insert_object(t1, u64_varkey(0), rec(1));
// t0 should win, t1 should abort
AssertSuccessfulCommit(t0);
AssertFailedCommit(t1);
}
txn_epoch_sync<TxnType>::sync();
txn_epoch_sync<TxnType>::finish();
}
}
template <template <typename> class TxnType, typename Traits>
static void
test_inc_value_size()
{
for (size_t txn_flags_idx = 0;
txn_flags_idx < ARRAY_NELEMS(TxnFlags);
txn_flags_idx++) {
const uint64_t txn_flags = TxnFlags[txn_flags_idx];
txn_btree<TxnType> btr;
typename Traits::StringAllocator arena;
const size_t upper = numeric_limits<dbtuple::node_size_type>::max();
for (size_t i = 1; i < upper; i++) {
const string v(i, 'a');
TxnType<Traits> t(txn_flags, arena);
btr.insert(t, u64_varkey(0), (const uint8_t *) v.data(), v.size());
AssertSuccessfulCommit(t);
}
txn_epoch_sync<TxnType>::sync();
txn_epoch_sync<TxnType>::finish();
}
}
template <template <typename> class TxnType, typename Traits>
static void
test_multi_btree()
{
for (size_t txn_flags_idx = 0;
txn_flags_idx < ARRAY_NELEMS(TxnFlags);
txn_flags_idx++) {
const uint64_t txn_flags = TxnFlags[txn_flags_idx];
txn_btree<TxnType> btr0, btr1;
typename Traits::StringAllocator arena;
for (size_t i = 0; i < 100; i++) {
TxnType<Traits> t(txn_flags, arena);
btr0.insert_object(t, u64_varkey(i), rec(123));
btr1.insert_object(t, u64_varkey(i), rec(123));
AssertSuccessfulCommit(t);
}
for (size_t i = 0; i < 100; i++) {
TxnType<Traits> t(txn_flags, arena);
string v0, v1;
bool ret0 = btr0.search(t, u64_varkey(i), v0);
bool ret1 = btr1.search(t, u64_varkey(i), v1);
AssertSuccessfulCommit(t);
ALWAYS_ASSERT_COND_IN_TXN(t, ret0);
ALWAYS_ASSERT_COND_IN_TXN(t, !v0.empty());
ALWAYS_ASSERT_COND_IN_TXN(t, ret1);
ALWAYS_ASSERT_COND_IN_TXN(t, !v1.empty());
AssertByteEquality(rec(123), v0);
AssertByteEquality(rec(123), v1);
}
txn_epoch_sync<TxnType>::sync();
txn_epoch_sync<TxnType>::finish();
}
}
template <template <typename> class TxnType, typename Traits>
static void
test_read_only_snapshot()
{
for (size_t txn_flags_idx = 0;
txn_flags_idx < ARRAY_NELEMS(TxnFlags);
txn_flags_idx++) {
const uint64_t txn_flags = TxnFlags[txn_flags_idx];
txn_btree<TxnType> btr;
typename Traits::StringAllocator arena;
{
TxnType<Traits> t(txn_flags, arena);
btr.insert_object(t, u64_varkey(0), rec(0));
AssertSuccessfulCommit(t);
}
// XXX(stephentu): HACK! we need to wait for the GC to
// compute a new consistent snapshot version that includes this
// latest update
txn_epoch_sync<TxnType>::sync();
{
TxnType<Traits>
t0(txn_flags, arena),
t1(txn_flags | transaction_base::TXN_FLAG_READ_ONLY, arena);
string v0, v1;
ALWAYS_ASSERT_COND_IN_TXN(t0, btr.search(t0, u64_varkey(0), v0));
ALWAYS_ASSERT_COND_IN_TXN(t0, !v0.empty());
AssertByteEquality(rec(0), v0);
btr.insert_object(t0, u64_varkey(0), rec(1));
ALWAYS_ASSERT_COND_IN_TXN(t1, btr.search(t1, u64_varkey(0), v1));
ALWAYS_ASSERT_COND_IN_TXN(t1, !v1.empty());
AssertByteEquality(rec(0), v1);
AssertSuccessfulCommit(t0);
AssertSuccessfulCommit(t1);
}
txn_epoch_sync<TxnType>::sync();
txn_epoch_sync<TxnType>::finish();
}
}
namespace test_long_keys_ns {
static inline string
make_long_key(int32_t a, int32_t b, int32_t c, int32_t d) {
char buf[4 * sizeof(int32_t)];
int32_t *p = (int32_t *) &buf[0];
*p++ = a;
*p++ = b;
*p++ = c;
*p++ = d;
return string(&buf[0], ARRAY_NELEMS(buf));
}
template <template <typename> class Protocol>
class counting_scan_callback : public txn_btree<Protocol>::search_range_callback {
public:
counting_scan_callback(uint64_t expect) : ctr(0), expect(expect) {}
virtual bool
invoke(const typename txn_btree<Protocol>::keystring_type &k, const string &v)
{
AssertByteEquality(rec(expect), v);
ctr++;
return true;
}
size_t ctr;
uint64_t expect;
};
}
namespace test_insert_same_key_ns {
struct rec0 { rec0(int ch) { NDB_MEMSET(&buf[0], ch, sizeof(buf)); } char buf[8]; };
struct rec1 { rec1(int ch) { NDB_MEMSET(&buf[0], ch, sizeof(buf)); } char buf[128]; };
struct rec2 { rec2(int ch) { NDB_MEMSET(&buf[0], ch, sizeof(buf)); } char buf[1024]; };
struct rec3 { rec3(int ch) { NDB_MEMSET(&buf[0], ch, sizeof(buf)); } char buf[2048]; };
struct rec4 { rec4(int ch) { NDB_MEMSET(&buf[0], ch, sizeof(buf)); } char buf[4096]; };
}
template <template <typename> class TxnType, typename Traits>
static void
test_long_keys()
{
using namespace test_long_keys_ns;
const size_t N = 10;
for (size_t txn_flags_idx = 0;
txn_flags_idx < ARRAY_NELEMS(TxnFlags);
txn_flags_idx++) {
const uint64_t txn_flags = TxnFlags[txn_flags_idx];
txn_btree<TxnType> btr;
typename Traits::StringAllocator arena;
{
TxnType<Traits> t(txn_flags, arena);
for (size_t a = 0; a < N; a++)
for (size_t b = 0; b < N; b++)
for (size_t c = 0; c < N; c++)
for (size_t d = 0; d < N; d++) {
const string k = make_long_key(a, b, c, d);
btr.insert_object(t, varkey(k), rec(1));
}
AssertSuccessfulCommit(t);
}
{
TxnType<Traits> t(txn_flags, arena);
const string lowkey_s = make_long_key(1, 2, 3, 0);
const string highkey_s = make_long_key(1, 2, 3, N);
const varkey highkey(highkey_s);
counting_scan_callback<TxnType> c(1);
btr.search_range_call(t, varkey(lowkey_s), &highkey, c);
AssertSuccessfulCommit(t);
if (c.ctr != N)
cerr << "c.ctr: " << c.ctr << ", N: " << N << endl;
ALWAYS_ASSERT_COND_IN_TXN(t, c.ctr == N);
}
#ifdef HAVE_REVERSE_RANGE_SCANS
{
TxnType<Traits> t(txn_flags, arena);
const string lowkey_s = make_long_key(4, 5, 3, 0);
const string highkey_s = make_long_key(4, 5, 3, N);
const varkey lowkey(lowkey_s);
counting_scan_callback<TxnType> c(1);
btr.rsearch_range_call(t, varkey(highkey_s), &lowkey, c);
AssertSuccessfulCommit(t);
if (c.ctr != (N-1))
cerr << "c.ctr: " << c.ctr << ", N: " << N << endl;
ALWAYS_ASSERT_COND_IN_TXN(t, c.ctr == (N-1));
}
#endif
txn_epoch_sync<TxnType>::sync();
txn_epoch_sync<TxnType>::finish();
}
cerr << "test_long_keys passed" << endl;
}
template <template <typename> class TxnType, typename Traits>
static void
test_long_keys2()
{
using namespace test_long_keys_ns;
for (size_t txn_flags_idx = 0;
txn_flags_idx < ARRAY_NELEMS(TxnFlags);
txn_flags_idx++) {
const uint64_t txn_flags = TxnFlags[txn_flags_idx];
const uint8_t lowkey_cstr[] = {
0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x02, 0x45, 0x49, 0x4E, 0x47,
0x41, 0x54, 0x49, 0x4F, 0x4E, 0x45, 0x49, 0x4E, 0x47, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
};
const string lowkey_s((const char *) &lowkey_cstr[0], ARRAY_NELEMS(lowkey_cstr));
const uint8_t highkey_cstr[] = {
0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x02, 0x45, 0x49, 0x4E, 0x47,
0x41, 0x54, 0x49, 0x4F, 0x4E, 0x45, 0x49, 0x4E, 0x47, 0x00, 0x00, 0x00,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF
};
const string highkey_s((const char *) &highkey_cstr[0], ARRAY_NELEMS(highkey_cstr));
txn_btree<TxnType> btr;
typename Traits::StringAllocator arena;
{
TxnType<Traits> t(txn_flags, arena);
btr.insert_object(t, varkey(lowkey_s), rec(12345));
AssertSuccessfulCommit(t);
}
{
TxnType<Traits> t(txn_flags, arena);
string v;
ALWAYS_ASSERT_COND_IN_TXN(t, btr.search(t, varkey(lowkey_s), v));
AssertByteEquality(rec(12345), v);
AssertSuccessfulCommit(t);
}
{
TxnType<Traits> t(txn_flags, arena);
counting_scan_callback<TxnType> c(12345);
const varkey highkey(highkey_s);
btr.search_range_call(t, varkey(lowkey_s), &highkey, c);
AssertSuccessfulCommit(t);
ALWAYS_ASSERT_COND_IN_TXN(t, c.ctr == 1);
}
txn_epoch_sync<TxnType>::sync();
txn_epoch_sync<TxnType>::finish();
}
}
template <template <typename> class TxnType, typename Traits>
static void
test_insert_same_key()
{
using namespace test_insert_same_key_ns;
for (size_t txn_flags_idx = 0;
txn_flags_idx < ARRAY_NELEMS(TxnFlags);
txn_flags_idx++) {
const uint64_t txn_flags = TxnFlags[txn_flags_idx];
txn_btree<TxnType> btr;
typename Traits::StringAllocator arena;
{
TxnType<Traits> t(txn_flags, arena);
btr.insert_object(t, u64_varkey(0), rec0('a'));
btr.insert_object(t, u64_varkey(0), rec1('b'));
btr.insert_object(t, u64_varkey(0), rec2('c'));
AssertSuccessfulCommit(t);
}
{
TxnType<Traits> t(txn_flags, arena);
btr.insert_object(t, u64_varkey(0), rec3('d'));
btr.insert_object(t, u64_varkey(0), rec4('e'));
AssertSuccessfulCommit(t);
}
txn_epoch_sync<TxnType>::sync();
txn_epoch_sync<TxnType>::finish();
}
}
#define TESTREC_KEY_FIELDS(x, y) \
x(int32_t,k0) \
y(int32_t,k1)
#define TESTREC_VALUE_FIELDS(x, y) \
x(int32_t,v0) \
y(int16_t,v1) \
y(inline_str_fixed<10>,v2)
DO_STRUCT(testrec, TESTREC_KEY_FIELDS, TESTREC_VALUE_FIELDS)
namespace test_typed_btree_ns {
static const pair<testrec::key, testrec::value> scan_values[] = {
{testrec::key(10, 1), testrec::value(123456 + 1, 10, "A")},
{testrec::key(10, 2), testrec::value(123456 + 2, 10, "B")},
{testrec::key(10, 3), testrec::value(123456 + 3, 10, "C")},
{testrec::key(10, 4), testrec::value(123456 + 4, 10, "D")},
{testrec::key(10, 5), testrec::value(123456 + 5, 10, "E")},
};
template <template <typename> class Protocol>
class scan_callback : public typed_txn_btree<Protocol, schema<testrec>>::search_range_callback {
public:
constexpr scan_callback() : n(0) {}
virtual bool
invoke(const testrec::key &key,
const testrec::value &value)
{
ALWAYS_ASSERT(n < ARRAY_NELEMS(scan_values));
ALWAYS_ASSERT(scan_values[n].first == key);
ALWAYS_ASSERT(scan_values[n].second.v2 == value.v2);
n++;
return true;
}
private:
size_t n;
};
}
template <template <typename> class TxnType, typename Traits>
static void
test_typed_btree()
{
using namespace test_typed_btree_ns;
typedef typed_txn_btree<TxnType, schema<testrec>> ttxn_btree_type;
ttxn_btree_type btr;
typename Traits::StringAllocator arena;
typedef TxnType<Traits> txn_type;
const testrec::key k0(1, 1);
const testrec::value v0(2, 3, "hello");
{
txn_type t(0, arena);
testrec::value v;
ALWAYS_ASSERT_COND_IN_TXN(t, !btr.search(t, k0, v));
btr.insert(t, k0, v0);
AssertSuccessfulCommit(t);
}
{
txn_type t(0, arena);
testrec::value v;
ALWAYS_ASSERT_COND_IN_TXN(t, btr.search(t, k0, v));
ALWAYS_ASSERT_COND_IN_TXN(t, v0 == v);
AssertSuccessfulCommit(t);
}
{
txn_type t(0, arena);
testrec::value v;
const bool ret = btr.search(t, k0, v, FIELDS(1, 2));
ALWAYS_ASSERT_COND_IN_TXN(t, ret);
ALWAYS_ASSERT_COND_IN_TXN(t, v.v1 == v0.v1);
ALWAYS_ASSERT_COND_IN_TXN(t, v.v2 == v0.v2);
AssertSuccessfulCommit(t);
}
{
txn_type t(0, arena);
testrec::value v;
const bool ret = btr.search(t, k0, v, FIELDS(0, 2));
ALWAYS_ASSERT_COND_IN_TXN(t, ret);
ALWAYS_ASSERT_COND_IN_TXN(t, v.v0 == v0.v0);
ALWAYS_ASSERT_COND_IN_TXN(t, v.v2 == v0.v2);
AssertSuccessfulCommit(t);
}
{
txn_type t(0, arena);
for (size_t i = 0; i < ARRAY_NELEMS(scan_values); i++)
btr.insert(t, scan_values[i].first, scan_values[i].second);
AssertSuccessfulCommit(t);
}
{
txn_type t(0, arena);
const testrec::key begin(10, 0);
scan_callback<TxnType> cb;
btr.search_range_call(t, begin, nullptr, cb, false, FIELDS(2));
AssertSuccessfulCommit(t);
}
txn_epoch_sync<TxnType>::sync();
txn_epoch_sync<TxnType>::finish();
cerr << "test_typed_btree() passed" << endl;
}
template <template <typename> class Protocol>
class txn_btree_worker : public ndb_thread {
public:
txn_btree_worker(txn_btree<Protocol> &btr, uint64_t txn_flags)
: btr(&btr), txn_flags(txn_flags) {}
inline uint64_t get_txn_flags() const { return txn_flags; }
protected:
txn_btree<Protocol> *const btr;
const uint64_t txn_flags;
};
namespace mp_stress_test_allocator_ns {
static const size_t nworkers = 28;
static const size_t nkeys = nworkers * 4;
static atomic<bool> running(true);
template <template <typename> class TxnType, typename Traits>
class worker : public txn_btree_worker<TxnType> {
public:
worker(unsigned id, txn_btree<TxnType> &btr, uint64_t txn_flags)
: txn_btree_worker<TxnType>(btr, txn_flags),
id(id), commits(0), aborts(0) {}
~worker() {}
virtual void run()
{
rcu::s_instance.pin_current_thread(id);
fast_random r(reinterpret_cast<unsigned long>(this));
string v;
while (running.load()) {
typename Traits::StringAllocator arena;
TxnType<Traits> t(this->txn_flags, arena);
try {
// RMW on a small space of keys
const u64_varkey k(r.next() % nkeys);
ALWAYS_ASSERT_COND_IN_TXN(t, this->btr->search(t, k, v));
((rec *) v.data())->v++;
this->btr->put(t, k, v);
t.commit(true);
commits++;
} catch (transaction_abort_exception &e) {
aborts++;
}
}
}
unsigned get_id() const { return id; }
unsigned get_commits() const { return commits; }
unsigned get_aborts() const { return aborts; }
private:
unsigned id;
unsigned commits;
unsigned aborts;
};
};
template <template <typename> class TxnType, typename Traits>
static void
mp_stress_test_allocator()
{
using namespace mp_stress_test_allocator_ns;
txn_btree<TxnType> btr;
{
rcu::s_instance.pin_current_thread(0);
typename Traits::StringAllocator arena;
TxnType<Traits> t(0, arena);
for (size_t i = 0; i < nkeys; i++)
btr.insert_object(t, u64_varkey(i), rec(0));
AssertSuccessfulCommit(t);
}
vector< shared_ptr< worker<TxnType, Traits> > > v;
for (size_t i = 0; i < nworkers; i++)
v.emplace_back(new worker<TxnType, Traits>(i, btr, 0));
for (auto &p : v)
p->start();
sleep(60);
running.store(false);
for (auto &p : v) {
p->join();
cerr << "worker " << p->get_id()
<< " commits " << p->get_commits()
<< " aborts " << p->get_aborts()
<< endl;
}
cerr << "mp_stress_test_allocator passed" << endl;
}
namespace mp_stress_test_insert_removes_ns {
struct big_rec {
static const size_t S = numeric_limits<dbtuple::node_size_type>::max();
char buf[S];
};
static const size_t nworkers = 4;
static atomic<bool> running(true);
template <template <typename> class TxnType, typename Traits>
class worker : public txn_btree_worker<TxnType> {
public:
worker(txn_btree<TxnType> &btr, uint64_t txn_flags)
: txn_btree_worker<TxnType>(btr, txn_flags) {}
~worker() {}
virtual void run()
{
fast_random r(reinterpret_cast<unsigned long>(this));
while (running.load()) {
typename Traits::StringAllocator arena;
TxnType<Traits> t(this->txn_flags, arena);
try {
switch (r.next() % 3) {
case 0:
this->btr->insert_object(t, u64_varkey(0), rec(1));
break;
case 1:
this->btr->insert_object(t, u64_varkey(0), big_rec());
break;
case 2:
this->btr->remove(t, u64_varkey(0));
break;
}
t.commit(true);
} catch (transaction_abort_exception &e) {
}
}
}
};
}
template <template <typename> class TxnType, typename Traits>
static void
mp_stress_test_insert_removes()
{
using namespace mp_stress_test_insert_removes_ns;
txn_btree<TxnType> btr;
vector< shared_ptr< worker<TxnType, Traits> > > v;
for (size_t i = 0; i < nworkers; i++)
v.emplace_back(new worker<TxnType, Traits>(btr, 0));
for (auto &p : v)
p->start();
sleep(5); // let many epochs pass
running.store(false);
for (auto &p : v)
p->join();
}
namespace mp_test1_ns {
// read-modify-write test (counters)
const size_t niters = 1000;
template <template <typename> class TxnType, typename Traits>
class worker : public txn_btree_worker<TxnType> {
public:
worker(txn_btree<TxnType> &btr, uint64_t txn_flags)
: txn_btree_worker<TxnType>(btr, txn_flags) {}
~worker() {}
virtual void run()
{
for (size_t i = 0; i < niters; i++) {
retry:
typename Traits::StringAllocator arena;
TxnType<Traits> t(this->txn_flags, arena);
try {
rec r;
string v;
if (!this->btr->search(t, u64_varkey(0), v)) {
r.v = 1;
} else {
r = *((const rec *) v.data());
r.v++;
}
this->btr->insert_object(t, u64_varkey(0), r);
t.commit(true);
} catch (transaction_abort_exception &e) {
goto retry;
}
}
}
};
}
template <template <typename> class TxnType, typename Traits>
static void
mp_test1()
{
using namespace mp_test1_ns;
for (size_t txn_flags_idx = 0;
txn_flags_idx < ARRAY_NELEMS(TxnFlags);
txn_flags_idx++) {
const uint64_t txn_flags = TxnFlags[txn_flags_idx];
txn_btree<TxnType> btr;
typename Traits::StringAllocator arena;
worker<TxnType, Traits> w0(btr, txn_flags);
worker<TxnType, Traits> w1(btr, txn_flags);
worker<TxnType, Traits> w2(btr, txn_flags);
worker<TxnType, Traits> w3(btr, txn_flags);
w0.start(); w1.start(); w2.start(); w3.start();
w0.join(); w1.join(); w2.join(); w3.join();
{
TxnType<Traits> t(txn_flags, arena);
string v;
ALWAYS_ASSERT_COND_IN_TXN(t, btr.search(t, u64_varkey(0), v));
ALWAYS_ASSERT_COND_IN_TXN(t, !v.empty());
const uint64_t rv = ((const rec *) v.data())->v;
if (rv != (niters * 4))
cerr << "v: " << rv << ", expected: " << (niters * 4) << endl;
ALWAYS_ASSERT_COND_IN_TXN(t, rv == (niters * 4));
AssertSuccessfulCommit(t);
}
txn_epoch_sync<TxnType>::sync();
txn_epoch_sync<TxnType>::finish();
}
}
namespace mp_test2_ns {
static const uint64_t ctr_key = 0;
static const uint64_t range_begin = 100;
static const uint64_t range_end = 150;
struct control_rec {
uint32_t count_;
uint32_t values_[range_end - range_begin];
control_rec()
: count_(0)
{
NDB_MEMSET(&values_[0], 0, sizeof(values_));
}
#if 0
void
sanity_check() const
{
INVARIANT(count_ <= ARRAY_NELEMS(values_));
if (!count_)
return;
uint32_t last = values_[0];
INVARIANT(last >= range_begin && last < range_end);
for (size_t i = 1; i < count_; last = values_[i], i++) {
INVARIANT(last < values_[i]);
INVARIANT(values_[i] >= range_begin && values_[i] < range_end);
}
}
#else
inline void sanity_check() const {}
#endif
// assumes list is in ascending order, no dups, and there is space
// remaining
//
// inserts in ascending order
void
insert(uint32_t v)
{
if (count_ >= ARRAY_NELEMS(values_)) {
cerr << "ERROR when trying to insert " << v
<< ": " << vectorize() << endl;
}
INVARIANT(count_ < ARRAY_NELEMS(values_));
if (!count_ || values_[count_ - 1] < v) {
values_[count_++] = v;
sanity_check();
INVARIANT(contains(v));
return;
}
for (size_t i = 0; i < count_; i++) {
if (values_[i] > v) {
// move values_[i, count_) into slots values_[i+1, count_+1)
memmove(&values_[i+1], &values_[i], (count_ - i) * sizeof(uint32_t));
values_[i] = v;
count_++;
sanity_check();
INVARIANT(contains(v));
return;
}
}
}
inline bool
contains(uint32_t v) const
{
for (size_t i = 0; i < count_; i++)
if (values_[i] == v)
return true;
return false;
}
// removes v from list, returns true if actual removal happened.
// assumes v is in ascending order with no dups
bool
remove(uint32_t v)
{
for (size_t i = 0; i < count_; i++) {
if (values_[i] == v) {
// move values_[i+1, count_) into slots values_[i, count_-1)
memmove(&values_[i], &values_[i+1], (count_ - (i+1)) * sizeof(uint32_t));
count_ -= 1;
sanity_check();
INVARIANT(!contains(v));
// no dups assumption
return true;
} else if (values_[i] > v) {
// ascending order assumption
break;
}