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Merge pull request #2742

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7c7d3672 Increase LMDB maxreaders if large number of threads in use (Howard Chu)
6738753b Use max_concurrency as-is (Howard Chu)
This commit is contained in:
Riccardo Spagni 2017-11-14 15:30:03 +02:00
commit 0d0ce8c21e
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2 changed files with 8 additions and 2 deletions
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6
src/blockchain_db/lmdb/db_lmdb.cpp
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@ -34,6 +34,7 @@
#include <cstring> // memcpy
#include <random>
#include "common/util.h"
#include "cryptonote_basic/cryptonote_format_utils.h"
#include "crypto/crypto.h"
#include "profile_tools.h"
@ -1135,6 +1136,11 @@ void BlockchainLMDB::open(const std::string& filename, const int db_flags)
if ((result = mdb_env_set_maxdbs(m_env, 20)))
throw0(DB_ERROR(lmdb_error("Failed to set max number of dbs: ", result).c_str()));
int threads = tools::get_max_concurrency();
if (threads > 110 && /* maxreaders default is 126, leave some slots for other read processes */
(result = mdb_env_set_maxreaders(m_env, threads+16)))
throw0(DB_ERROR(lmdb_error("Failed to set max number of readers: ", result).c_str()));
size_t mapsize = DEFAULT_MAPSIZE;
if (db_flags & DBF_FAST)

4
src/common/threadpool.cpp
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@ -39,7 +39,7 @@ namespace tools
threadpool::threadpool() : running(true), active(0) {
boost::thread::attributes attrs;
attrs.set_stack_size(THREAD_STACK_SIZE);
max = tools::get_max_concurrency() * 2;
max = tools::get_max_concurrency();
size_t i = max;
while(i--) {
threads.push_back(boost::thread(attrs, boost::bind(&threadpool::run, this)));
@ -74,7 +74,7 @@ void threadpool::submit(waiter *obj, std::function<void()> f) {
}
int threadpool::get_max_concurrency() {
return max / 2;
return max;
}
void threadpool::waiter::wait() {