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| author | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2013-08-07 11:51:55 +0000 |
|---|---|---|
| committer | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2013-08-07 14:02:04 +0200 |
| commit | a583a2bc59a4ee2b067e5520f6c5bc0c61852c32 (patch) | |
| tree | 137be66f58b664dbf0aa21138000d711d5e00162 /configure.ac | |
| parent | 263d6682224f516aed74286453c5e2e097a38aa6 (diff) | |
Run the daemon worker on the same CPU as the client
On a system with multiple CPUs, running Nix operations through the
daemon is significantly slower than "direct" mode:
$ NIX_REMOTE= nix-instantiate '<nixos>' -A system
real 0m0.974s
user 0m0.875s
sys 0m0.088s
$ NIX_REMOTE=daemon nix-instantiate '<nixos>' -A system
real 0m2.118s
user 0m1.463s
sys 0m0.218s
The main reason seems to be that the client and the worker get moved
to a different CPU after every call to the worker. This patch adds a
hack to lock them to the same CPU. With this, the overhead of going
through the daemon is very small:
$ NIX_REMOTE=daemon nix-instantiate '<nixos>' -A system
real 0m1.074s
user 0m0.809s
sys 0m0.098s
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 9ffefa914..89f009923 100644 --- a/configure.ac +++ b/configure.ac @@ -127,6 +127,10 @@ AC_CHECK_HEADERS([sys/mount.h], [], [], AC_CHECK_FUNCS([lutimes]) +# Check for sched_setaffinity. +AC_CHECK_FUNCS([sched_setaffinity]) + + # Check whether the store optimiser can optimise symlinks. AC_MSG_CHECKING([whether it is possible to create a link to a symlink]) ln -s bla tmp_link |