diff options
author | Richard Purdie <richard.purdie@linuxfoundation.org> | 2013-08-31 23:40:55 +0100 |
---|---|---|
committer | Richard Purdie <richard.purdie@linuxfoundation.org> | 2013-09-01 08:53:29 +0100 |
commit | 9bee497960889d9baa0a4284d79a384b18a8e826 (patch) | |
tree | 3aae96ba13432a21b973fb230f1f1918072e8baa /lib/bb/server/process.py | |
parent | 1a175b51f80d13f747b653d29e9c0d2201b5109c (diff) | |
download | bitbake-9bee497960889d9baa0a4284d79a384b18a8e826.tar.gz |
server/process, server/xmlrpc, runqueue: Use select.select() on fds, not time.sleep()
The existing backend server implementations were inefficient since they
were sleeping for the full length of the timeouts rather than being woken when
there was data ready for them. It was assumed they would wake and perhaps did
when we forked processes directory but that is no longer the case.
This updates both the process and xmlrpc backends to wait using select(). This
does mean we need to pass the file descriptors to wait on from the internals
who know which these file descriptors are but this is a logical improvement.
Tests of a pathaolgical load on the process server of ~420 rapid tasks
executed on a server with BB_NUMBER_THREAD=48 went from a wall clock
measurement of the overall command execution time of 75s to a much more
reasonable 24s.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'lib/bb/server/process.py')
-rw-r--r-- | lib/bb/server/process.py | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/lib/bb/server/process.py b/lib/bb/server/process.py index e2cec49b7..c0af052eb 100644 --- a/lib/bb/server/process.py +++ b/lib/bb/server/process.py @@ -29,6 +29,7 @@ import os import signal import sys import time +import select from Queue import Empty from multiprocessing import Event, Process, util, Queue, Pipe, queues @@ -105,7 +106,7 @@ class ProcessServer(Process, BaseImplServer): command = self.command_channel.recv() self.runCommand(command) - self.idle_commands(.1) + self.idle_commands(.1, [self.event_queue._reader, self.command_channel]) except Exception: logger.exception('Running command %s', command) @@ -115,7 +116,7 @@ class ProcessServer(Process, BaseImplServer): self.cooker.stop() self.idle_commands(.1) - def idle_commands(self, delay): + def idle_commands(self, delay, fds = []): nextsleep = delay for function, data in self._idlefuns.items(): @@ -127,15 +128,15 @@ class ProcessServer(Process, BaseImplServer): nextsleep = None elif nextsleep is None: continue - elif retval < nextsleep: - nextsleep = retval + else: + fds = fds + retval except SystemExit: raise except Exception: logger.exception('Running idle function') if nextsleep is not None: - time.sleep(nextsleep) + select.select(fds,[],[],nextsleep) def runCommand(self, command): """ |