diff options
author | Joey Hess <joey@gnu.kitenet.net> | 2009-04-04 17:27:48 -0400 |
---|---|---|
committer | Joey Hess <joey@gnu.kitenet.net> | 2009-04-04 17:27:48 -0400 |
commit | 8e92468eae9ac0ab8161a0c71ff6c6a0a8aef07a (patch) | |
tree | 9e26465e0ca98a5f3cbc6c72a0cace4bf83b93db /doc/todo/avoid_thrashing.mdwn | |
parent | 78a69e5bd632eb86ef8135e9c1d05d2c48b43362 (diff) | |
parent | 08fda4c9d374de1d3de3172a192d4d915d3dc0c1 (diff) | |
download | ikiwiki-8e92468eae9ac0ab8161a0c71ff6c6a0a8aef07a.tar ikiwiki-8e92468eae9ac0ab8161a0c71ff6c6a0a8aef07a.tar.gz |
Merge branch 'master'
Conflicts:
doc/ikiwiki-makerepo.mdwn
Diffstat (limited to 'doc/todo/avoid_thrashing.mdwn')
-rw-r--r-- | doc/todo/avoid_thrashing.mdwn | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/doc/todo/avoid_thrashing.mdwn b/doc/todo/avoid_thrashing.mdwn new file mode 100644 index 000000000..45b11d872 --- /dev/null +++ b/doc/todo/avoid_thrashing.mdwn @@ -0,0 +1,22 @@ +Problem: Suppose a server has 256 mb ram. Each ikiwiki process needs about +15 mb, before it's loaded the index. (And maybe 25 after, but only one such +process runs at any time). That allows for about 16 ikiwiki processes to +run concurrently on a server, before it starts to swap. Of course, anything +else that runs on the server and eats memory will affect this. + +One could just set `MaxClients 16` in the apache config, but then it's also +limited to 16 clients serving static pages, which is silly. Also, 16 is +optimistic -- 8 might be a saner choice. And then, what if something on the +server decides to eat a lot of memory? Ikiwiki can again overflow memory +and thrash. + +It occurred to me that the ikiwiki cgi wrapper could instead do locking of +its own (say of `.ikiwiki/cgilock`). The wrapper only needs a few kb to +run, and it starts *fast*. So hundreds could be running waiting for a lock +with no ill effects. Crank `MaxClients` up to 256? No problem.. + +And there's no real reason to allow more than one ikiwiki cgi to run at a +time. Since almost all uses of the CGI lock the index, only one can really +be doing anything at a time. --[[Joey]] + +[[done]] |