Re: [PHP] Including files on NFS mount slow with APC enabled
I now notice that when I replace include_once with include the open()
call disappears. That's very nice, but why does include_once need to
open the file, even when apc.include_once_override is enabled? Is this a
bug?
On 08/16/2010 03:21 PM, Mark Hunting wrote:
I am struggling with the performance of some websites that use a lot of
includes (using include_once). The files are on a NFS mount (NFSv4), and
I use APC to speed things up. APC has enough memory, and I see all
included files are in the APC cache. apc.include_once_override is
enabled. This is on a Ubuntu Linux 10.04 server.
What surprises me is that using strace I see apache open()ing all
included files. I would think this is not necessary as APC has these
files in its cache. Opening a file takes 1-3 ms, the websites include
100-200 files, so this costs about half a second for each request. I
tried a lot to prevent this but my options are exhausted. Is it normal
that all these files are open()ed each time, and if so how can I speed
up these includes?
Part of the trace is below, look especially at the first line where 2ms
are lost while this file is in the APC cache:
open(/[removed]/library/Zend/Application.php, O_RDONLY) = 1440 0.002035
fstat(1440, {st_mode=S_IFREG|0755, st_size=11365, ...}) = 0 0.000137
fstat(1440, {st_mode=S_IFREG|0755, st_size=11365, ...}) = 0 0.000124
fstat(1440, {st_mode=S_IFREG|0755, st_size=11365, ...}) = 0 0.000133
mmap(NULL, 11365, PROT_READ, MAP_SHARED, 1440, 0) = 0x7faf3f068000
0.000395
stat(/[removed]/library/Zend/Application.php, {st_mode=S_IFREG|0755,
st_size=11365, ...}) = 0 0.000219
munmap(0x7faf3f068000, 11365) = 0 0.000151
close(1440) = 0 0.000845
Thanks,
Mark
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[PHP] Including files on NFS mount slow with APC enabled
I am struggling with the performance of some websites that use a lot of
includes (using include_once). The files are on a NFS mount (NFSv4), and
I use APC to speed things up. APC has enough memory, and I see all
included files are in the APC cache. apc.include_once_override is
enabled. This is on a Ubuntu Linux 10.04 server.
What surprises me is that using strace I see apache open()ing all
included files. I would think this is not necessary as APC has these
files in its cache. Opening a file takes 1-3 ms, the websites include
100-200 files, so this costs about half a second for each request. I
tried a lot to prevent this but my options are exhausted. Is it normal
that all these files are open()ed each time, and if so how can I speed
up these includes?
Part of the trace is below, look especially at the first line where 2ms
are lost while this file is in the APC cache:
open(/[removed]/library/Zend/Application.php, O_RDONLY) = 1440 0.002035
fstat(1440, {st_mode=S_IFREG|0755, st_size=11365, ...}) = 0 0.000137
fstat(1440, {st_mode=S_IFREG|0755, st_size=11365, ...}) = 0 0.000124
fstat(1440, {st_mode=S_IFREG|0755, st_size=11365, ...}) = 0 0.000133
mmap(NULL, 11365, PROT_READ, MAP_SHARED, 1440, 0) = 0x7faf3f068000
0.000395
stat(/[removed]/library/Zend/Application.php, {st_mode=S_IFREG|0755,
st_size=11365, ...}) = 0 0.000219
munmap(0x7faf3f068000, 11365) = 0 0.000151
close(1440) = 0 0.000845
Thanks,
Mark
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Re: [PHP] Including files on NFS mount slow with APC enabled
Hi,
APC checks by default if every included file was modified doing a stat
call. You can disable it, setting apc.stat to 0
(http://www.php.net/manual/en/apc.configuration.php#ini.apc.stat). Try
if that improves the performance. Of course, you should manually
delete the APC opcode cache every time you modify a PHP file, since
APC won't detect that it was modified.
Regards,
Jonathan
On Mon, Aug 16, 2010 at 10:21 AM, Mark Hunting m...@netexpo.nl wrote:
I am struggling with the performance of some websites that use a lot of
includes (using include_once). The files are on a NFS mount (NFSv4), and
I use APC to speed things up. APC has enough memory, and I see all
included files are in the APC cache. apc.include_once_override is
enabled. This is on a Ubuntu Linux 10.04 server.
What surprises me is that using strace I see apache open()ing all
included files. I would think this is not necessary as APC has these
files in its cache. Opening a file takes 1-3 ms, the websites include
100-200 files, so this costs about half a second for each request. I
tried a lot to prevent this but my options are exhausted. Is it normal
that all these files are open()ed each time, and if so how can I speed
up these includes?
Part of the trace is below, look especially at the first line where 2ms
are lost while this file is in the APC cache:
open(/[removed]/library/Zend/Application.php, O_RDONLY) = 1440 0.002035
fstat(1440, {st_mode=S_IFREG|0755, st_size=11365, ...}) = 0 0.000137
fstat(1440, {st_mode=S_IFREG|0755, st_size=11365, ...}) = 0 0.000124
fstat(1440, {st_mode=S_IFREG|0755, st_size=11365, ...}) = 0 0.000133
mmap(NULL, 11365, PROT_READ, MAP_SHARED, 1440, 0) = 0x7faf3f068000
0.000395
stat(/[removed]/library/Zend/Application.php, {st_mode=S_IFREG|0755,
st_size=11365, ...}) = 0 0.000219
munmap(0x7faf3f068000, 11365) = 0 0.000151
close(1440) = 0 0.000845
Thanks,
Mark
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Re: [PHP] Including files on NFS mount slow with APC enabled
Thanks for your answer. I have tested this option before, and it indeed
disables the stat() operation. However, it doesn't disable the open()
operation, which is about 10x slower than the stat() call (see my
example trace).
On 08/16/2010 07:21 PM, Jonathan Tapicer wrote:
Hi,
APC checks by default if every included file was modified doing a stat
call. You can disable it, setting apc.stat to 0
(http://www.php.net/manual/en/apc.configuration.php#ini.apc.stat). Try
if that improves the performance. Of course, you should manually
delete the APC opcode cache every time you modify a PHP file, since
APC won't detect that it was modified.
Regards,
Jonathan
On Mon, Aug 16, 2010 at 10:21 AM, Mark Hunting m...@netexpo.nl wrote:
I am struggling with the performance of some websites that use a lot of
includes (using include_once). The files are on a NFS mount (NFSv4), and
I use APC to speed things up. APC has enough memory, and I see all
included files are in the APC cache. apc.include_once_override is
enabled. This is on a Ubuntu Linux 10.04 server.
What surprises me is that using strace I see apache open()ing all
included files. I would think this is not necessary as APC has these
files in its cache. Opening a file takes 1-3 ms, the websites include
100-200 files, so this costs about half a second for each request. I
tried a lot to prevent this but my options are exhausted. Is it normal
that all these files are open()ed each time, and if so how can I speed
up these includes?
Part of the trace is below, look especially at the first line where 2ms
are lost while this file is in the APC cache:
open(/[removed]/library/Zend/Application.php, O_RDONLY) = 1440 0.002035
fstat(1440, {st_mode=S_IFREG|0755, st_size=11365, ...}) = 0 0.000137
fstat(1440, {st_mode=S_IFREG|0755, st_size=11365, ...}) = 0 0.000124
fstat(1440, {st_mode=S_IFREG|0755, st_size=11365, ...}) = 0 0.000133
mmap(NULL, 11365, PROT_READ, MAP_SHARED, 1440, 0) = 0x7faf3f068000
0.000395
stat(/[removed]/library/Zend/Application.php, {st_mode=S_IFREG|0755,
st_size=11365, ...}) = 0 0.000219
munmap(0x7faf3f068000, 11365) = 0 0.000151
close(1440) = 0 0.000845
Thanks,
Mark
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