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ircd::fs: Add gauge for rlimit_nofile in support section.

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This commit is contained in:
Jason Volk 2020-03-20 10:05:50 -07:00
parent 472ce01b50
commit a867cfa51a
3 changed files with 21 additions and 3 deletions
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3
include/ircd/fs/support.h
View file

@ -33,6 +33,9 @@ namespace ircd::fs::support
// Test if fallocate() is supported at target path
bool fallocate(const string_view &path, const write_opts &wopts = write_opts_default);
// Get the limit for number of opened files
size_t rlimit_nofile();
// Dump information to infolog
void dump_info();
}

4
ircd/db.cc
View file

@ -1182,9 +1182,7 @@ try
// limit maxfdto prevent too many small files degrading read perf; too low is
// bad for write perf.
opts->max_open_files = ircd::info::rlimit_nofile?
std::min(ircd::info::rlimit_nofile, 256UL): // limit when rlimit supported
256UL; // default when rlimit not supported.
opts->max_open_files = fs::support::rlimit_nofile();
// TODO: Check if these values can be increased; RocksDB may keep
// thread_local state preventing values > 1.

17
ircd/fs.cc
View file

@ -12,6 +12,7 @@
#include <RB_INC_SYS_STAT_H
#include <RB_INC_SYS_STATFS_H
#include <RB_INC_SYS_STATVFS_H
#include <RB_INC_SYS_RESOURCE_H
#include <boost/filesystem.hpp>
#include <RB_INC_SYS_SYSMACROS_H
@ -283,6 +284,22 @@ catch(const std::system_error &e)
throw;
}
#if defined(HAVE_SYS_RESOURCE_H) && defined(RLIMIT_NOFILE)
size_t
ircd::fs::support::rlimit_nofile()
{
rlimit rlim;
syscall(getrlimit, RLIMIT_NOFILE, &rlim);
return rlim.rlim_cur;
}
#else
size_t
ircd::fs::support::rlimit_nofile()
{
return -1;
}
#endif
///////////////////////////////////////////////////////////////////////////////
//
// fs.h / misc