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Only target 80% of threads for indexers by default.

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Using 100% - 1 tended to cause too much resource contention.
This commit is contained in:
Jacob Dufault 2017-10-24 19:18:47 -07:00
parent 37ab94e7b4
commit 39de197e8a
1 changed files with 7 additions and 4 deletions
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11
src/command_line.cc
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@ -1386,13 +1386,16 @@ bool QueryDbMainLoop(Config* config,
EnsureEndsInSlash(config->projectRoot);
// Start indexer threads.
// Set default indexer count if not specified.
if (config->indexerCount == 0) {
// If the user has not specified how many indexers to run, try to
// guess an appropriate value. Default to 80% utilization.
const float kDefaultTargetUtilization = 0.8;
config->indexerCount =
std::max<int>(std::thread::hardware_concurrency(), 2) - 1;
std::thread::hardware_concurrency() * kDefaultTargetUtilization;
if (config->indexerCount <= 0)
config->indexerCount = 1;
}
std::cerr << "[querydb] Starting " << config->indexerCount
<< " indexers" << std::endl;
LOG_S(INFO) << "Starting " << config->indexerCount << " indexers";
for (int i = 0; i < config->indexerCount; ++i) {
WorkThread::StartThread("indexer" + std::to_string(i), [=]() {
return IndexMain(config, file_consumer_shared, timestamp_manager,