Make eventlet.tpool's thread count configurable in object server

Code Issues Proposed changes

If you're running servers_per_port > 0 and threads_per_disk = 0 (as it
should be with servers_per_port on), each object-server process will
have 20 IO threads waiting around to service eventlet.tpool
calls. This is far too many; with servers_per_port, there's no real
benefit to having so many IO threads.
This commit makes it so that, when servers_per_port > 0, each object
server defaults to having one main thread and one IO thread.
Also, eventlet's tpool size is now configurable via the object-server
config file. If a tpool size is set, that's what we'll use regardless
of servers_per_port. This allows operators with an excess of threads
to remove some regardless of servers_per_port.
Change-Id: I8f8914b7e70f2510393eb7c5e6be9708631ac027
Closes-Bug: 1554233

This commit is contained in:

Samuel Merritt

2016年03月07日 18:18:35 -08:00

committed by Matthew Oliver

parent 0d5b2a867d

commit d9c4913e3b

4 changed files with 100 additions and 2 deletions

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23
etc/object-server.conf-sample

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@@ -124,6 +124,29 @@ use = egg:swift#object

#

# auto_create_account_prefix = .

#

# The number of threads in eventlet's thread pool. Most IO will occur

# in the object server's main thread, but certain "heavy" IO

# operations will occur in separate IO threads, managed by eventlet.

#

# The default value is auto, whose actual value is dependant on the

# servers_per_port value:

#

# - When servers_per_port is zero, the default value of

# eventlet_tpool_num_threads is empty, which uses eventlet's default

# (currently 20 threads).

#

# - When servers_per_port is nonzero, the default value of

# eventlet_tpool_num_threads is 1.

#

# But you may override this value to any integer value.

#

# Note that this value is threads per object-server process, so to

# compute the total number of IO threads on a node, you must multiply

# this by the number of object-server processes on the node.

#

# eventlet_tpool_num_threads = auto

# Configure parameter for creating specific server

# To handle all verbs, including replication verbs, do not specify

# "replication_server" (this is the default). To only handle replication,

Make eventlet.tpool's thread count configurable in object server

23 etc/object-server.conf-sample Unescape Escape View File

23
etc/object-server.conf-sample

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