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| author | Simon Marlow <marlowsd@gmail.com> | 2016-04-23 21:14:49 +0100 |
|---|---|---|
| committer | Simon Marlow <marlowsd@gmail.com> | 2016-06-10 21:25:54 +0100 |
| commit | 9e5ea67e268be2659cd30ebaed7044d298198ab0 (patch) | |
| tree | c395e74ee772ae0d59c852b3cbde743784b08d09 /rts/package.conf.in | |
| parent | b9fa72a24ba2cc3120912e6afedc9280d28d2077 (diff) | |
| download | haskell-9e5ea67e268be2659cd30ebaed7044d298198ab0.tar.gz | |
NUMA support
Summary:
The aim here is to reduce the number of remote memory accesses on
systems with a NUMA memory architecture, typically multi-socket servers.
Linux provides a NUMA API for doing two things:
* Allocating memory local to a particular node
* Binding a thread to a particular node
When given the +RTS --numa flag, the runtime will
* Determine the number of NUMA nodes (N) by querying the OS
* Assign capabilities to nodes, so cap C is on node C%N
* Bind worker threads on a capability to the correct node
* Keep a separate free lists in the block layer for each node
* Allocate the nursery for a capability from node-local memory
* Allocate blocks in the GC from node-local memory
For example, using nofib/parallel/queens on a 24-core 2-socket machine:
```
$ ./Main 15 +RTS -N24 -s -A64m
Total time 173.960s ( 7.467s elapsed)
$ ./Main 15 +RTS -N24 -s -A64m --numa
Total time 150.836s ( 6.423s elapsed)
```
The biggest win here is expected to be allocating from node-local
memory, so that means programs using a large -A value (as here).
According to perf, on this program the number of remote memory accesses
were reduced by more than 50% by using `--numa`.
Test Plan:
* validate
* There's a new flag --debug-numa=<n> that pretends to do NUMA without
actually making the OS calls, which is useful for testing the code
on non-NUMA systems.
* TODO: I need to add some unit tests
Reviewers: erikd, austin, rwbarton, ezyang, bgamari, hvr, niteria
Subscribers: thomie
Differential Revision: https://phabricator.haskell.org/D2199
Diffstat (limited to 'rts/package.conf.in')
| -rw-r--r-- | rts/package.conf.in | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/rts/package.conf.in b/rts/package.conf.in index b52a8672d5..d2b728ea88 100644 --- a/rts/package.conf.in +++ b/rts/package.conf.in @@ -37,6 +37,9 @@ extra-libraries: #ifdef HAVE_LIBFFI , "ffi" #endif +#ifdef HAVE_LIBNUMA + , "numa" +#endif #ifdef mingw32_HOST_OS ,"wsock32" /* for the linker */ ,"gdi32" /* for the linker */ @@ -179,4 +182,3 @@ framework-dirs: haddock-interfaces: haddock-html: - |