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Don't use redundant Env::NowMicros() calls

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Summary: After my patch for stall histograms, there are redundant calls to NowMicros() by both the stop watches and DBImpl::MakeRoomForWrites. So I removed the redundant calls such that the information is gotten from the stopwatch.

Test Plan:
make clean
make -j32 check

Reviewers: dhruba, haobo, MarkCallaghan

Reviewed By: dhruba

CC: leveldb

Differential Revision: https://reviews.facebook.net/D11883
This commit is contained in:
Jim Paton 2013-07-29 15:46:36 -07:00
parent abc90b067c
commit 6db52b525a
1 changed files with 8 additions and 8 deletions
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16
db/db_impl.cc
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@ -2442,12 +2442,12 @@ Status DBImpl::MakeRoomForWrite(bool force) {
// this delay hands over some CPU to the compaction thread in
// case it is sharing the same core as the writer.
mutex_.Unlock();
uint64_t t1 = env_->NowMicros();
uint64_t delayed;
{
StopWatch sw(env_, options_.statistics, STALL_L0_SLOWDOWN_COUNT);
env_->SleepForMicroseconds(1000);
delayed = sw.ElapsedMicros();
}
uint64_t delayed = env_->NowMicros() - t1;
RecordTick(options_.statistics, STALL_L0_SLOWDOWN_MICROS, delayed);
stall_level0_slowdown_ += delayed;
stall_level0_slowdown_count_++;
@ -2469,13 +2469,13 @@ Status DBImpl::MakeRoomForWrite(bool force) {
// ones are still being compacted, so we wait.
DelayLoggingAndReset();
Log(options_.info_log, "wait for memtable compaction...\n");
uint64_t t1 = env_->NowMicros();
uint64_t stall;
{
StopWatch sw(env_, options_.statistics,
STALL_MEMTABLE_COMPACTION_COUNT);
bg_cv_.Wait();
stall = sw.ElapsedMicros();
}
const uint64_t stall = env_->NowMicros() -t1;
RecordTick(options_.statistics, STALL_MEMTABLE_COMPACTION_MICROS, stall);
stall_memtable_compaction_ += stall;
stall_memtable_compaction_count_++;
@ -2483,13 +2483,13 @@ Status DBImpl::MakeRoomForWrite(bool force) {
options_.level0_stop_writes_trigger) {
// There are too many level-0 files.
DelayLoggingAndReset();
uint64_t t1 = env_->NowMicros();
Log(options_.info_log, "wait for fewer level0 files...\n");
uint64_t stall;
{
StopWatch sw(env_, options_.statistics, STALL_L0_NUM_FILES_COUNT);
bg_cv_.Wait();
stall = sw.ElapsedMicros();
}
const uint64_t stall = env_->NowMicros() - t1;
RecordTick(options_.statistics, STALL_L0_NUM_FILES_MICROS, stall);
stall_level0_num_files_ += stall;
stall_level0_num_files_count_++;
@ -2500,12 +2500,12 @@ Status DBImpl::MakeRoomForWrite(bool force) {
// Delay a write when the compaction score for any level is too large.
int max_level = versions_->MaxCompactionScoreLevel();
mutex_.Unlock();
uint64_t t1 = env_->NowMicros();
uint64_t delayed;
{
StopWatch sw(env_, options_.statistics, RATE_LIMIT_DELAY_COUNT);
env_->SleepForMicroseconds(1000);
delayed = sw.ElapsedMicros();
}
uint64_t delayed = env_->NowMicros() - t1;
stall_leveln_slowdown_[max_level] += delayed;
stall_leveln_slowdown_count_[max_level]++;
// Make sure the following value doesn't round to zero.