02-13-2020
I have seen cases like that when you have enormous disc cache synchronising... all is fine when pure transactional mode ( the periodic sync has hmmm "little" to update ) but when it comes to batches running, it fills the cache before periodic sync and then the system has to wait the end of forced sync (file cache OS side...)
Other contention possible big file cache with big SGA: parsing both and not finding reduces perfs...
Last edited by vbe; 02-13-2020 at 04:07 AM..
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LEARN ABOUT DEBIAN
glwaitsync
GLWAITSYNC(3G) [FIXME: manual] GLWAITSYNC(3G)
NAME
glWaitSync - instruct the GL server to block until the specified sync object becomes signaled
C SPECIFICATION
void glWaitSync(GLsync sync, GLbitfield flags, GLuint64 timeout);
PARAMETERS
sync
Specifies the sync object whose status to wait on.
flags
A bitfield controlling the command flushing behavior. flags may be zero.
timeout
Specifies the timeout that the server should wait before continuing. timeout must be GL_TIMEOUT_IGNORED.
DESCRIPTION
glWaitSync causes the GL server to block and wait until sync becomes signaled. sync is the name of an existing sync object upon which to
wait. flags and timeout are currently not used and must be set to zero and the special value GL_TIMEOUT_IGNORED, respectively[1].
glWaitSync will always wait no longer than an implementation-dependent timeout. The duration of this timeout in nanoseconds may be queried
by calling glGet() with the parameter GL_MAX_SERVER_WAIT_TIMEOUT. There is currently no way to determine whether glWaitSync unblocked
because the timeout expired or because the sync object being waited on was signaled.
If an error occurs, glWaitSync does not cause the GL server to block.
NOTES
glWaitSync is available only if the GL version is 3.2 or higher.
ERRORS
GL_INVALID_OPERATION is generated if sync is not the name of a sync object.
GL_INVALID_VALUE is generated if flags is not zero.
GL_INVALID_VALUE is generated if timeout is not GL_TIMEOUT_IGNORED.
SEE ALSO
glFenceSync(), glClientWaitSync()
COPYRIGHT
Copyright (C) 2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication
License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.
NOTES
1. flags and timeout are placeholders for anticipated future extensions of sync object capabilities. They must have these reserved values
in order that existing code calling glWaitSync operate properly in the presence of such extensions.
[FIXME: source] 05/30/2012 GLWAITSYNC(3G)