Hashar has uploaded a new change for review. (
https://gerrit.wikimedia.org/r/358799 )
Change subject: swift: save nscd CPU by using IP address
......................................................................
swift: save nscd CPU by using IP address
Some of the Swift process send metrics to statsd and the target host is
defined as 'localhost'. I found out on labs that it puts load on nscd
since each packet ends up triggering:
stat('/etc/resolv.conf')
open('/etc/host')
fstat(</etc/host>)
On a labs instance nscd was at 30% or so CPU. I have disabled statsd
entirely there. For production switching to '127.0.0.1' should be
slightly faster.
Ref:
https://phabricator.wikimedia.org/T160990#3345809
Bug: T160990
Change-Id: I50a376d2b1922bf85c8db1520e011a8726771a06
---
M hieradata/common/swift/proxy.yaml
M hieradata/common/swift/storage.yaml
2 files changed, 7 insertions(+), 2 deletions(-)
git pull ssh://gerrit.wikimedia.org:29418/operations/puppet
refs/changes/99/358799/1
diff --git a/hieradata/common/swift/proxy.yaml
b/hieradata/common/swift/proxy.yaml
index 80a026c..07494c9 100644
--- a/hieradata/common/swift/proxy.yaml
+++ b/hieradata/common/swift/proxy.yaml
@@ -1,4 +1,7 @@
-swift::proxy::statsd_host: 'localhost'
+# Use an IP since nscd is so slow
+# https://phabricator.wikimedia.org/T160990#3345809
+swift::proxy::statsd_host: '127.0.0.1'
+
swift::proxy::backend_url_format: 'sitelang'
swift::proxy::rewrite_thumb_server: 'imagescaler-rw.discovery.wmnet'
swift::proxy::dispersion_account: 'dispersion'
diff --git a/hieradata/common/swift/storage.yaml
b/hieradata/common/swift/storage.yaml
index 2c6160b..cf3961b 100644
--- a/hieradata/common/swift/storage.yaml
+++ b/hieradata/common/swift/storage.yaml
@@ -1 +1,3 @@
-swift::storage::statsd_host: 'localhost'
+# Use an IP since nscd is so slow
+# https://phabricator.wikimedia.org/T160990#3345809
+swift::storage::statsd_host: '127.0.0.1'
--
To view, visit https://gerrit.wikimedia.org/r/358799
To unsubscribe, visit https://gerrit.wikimedia.org/r/settings
Gerrit-MessageType: newchange
Gerrit-Change-Id: I50a376d2b1922bf85c8db1520e011a8726771a06
Gerrit-PatchSet: 1
Gerrit-Project: operations/puppet
Gerrit-Branch: production
Gerrit-Owner: Hashar <has...@free.fr>
_______________________________________________
MediaWiki-commits mailing list
MediaWiki-commits@lists.wikimedia.org
https://lists.wikimedia.org/mailman/listinfo/mediawiki-commits
