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Linux / Apache / PHP Scalability Issues
Posted on 2009-05-19
Hi,
We are having speed and scalability issues with our website hosted in LAMP environment. As i am new to Linux / Apache i am copying server related data here. Please let me know what i can do to imrove the scalability and speed of PHP scripts:
Current Memory Usage
total used free shared buffers cached
Mem: 3369064 3155716 213348 0 239616 2358752
-/+ buffers/cache: 557348 2811716
Swap: 4192956 68 4192888
Total: 7562020 3155784 4406236
Current Disk Usage
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 222G 15G 196G 7% /
/dev/sda1 251M 21M 217M 9% /boot
tmpfs 1.7G 0 1.7G 0% /dev/shm
/usr/tmpDSK 485M 460M 0 100% /tmp
Following is statstics from XCache
Caches: - Slots Size Avail % Clear Compiling Hits Misses Clogs OOMs Protected Cached Deleted GC
php#0 8.00 K 64.00 M 36.81 M no 83,690 985 10 0 no 976 0
php#1 8.00 K 64.00 M 38.20 M no 111,389 1,005 10 0 no 999 0
var#0 8.00 K 8.00 M 7.97 M - 0 0 0 0 no 0 0 29
We are having speed and scalability issues with our website hosted in LAMP environment. As i am new to Linux / Apache i am copying server related data here. Please let me know what i can do to imrove the scalability and speed of PHP scripts:
Current Memory Usage
total used free shared buffers cached
Mem: 3369064 3155716 213348 0 239616 2358752
-/+ buffers/cache: 557348 2811716
Swap: 4192956 68 4192888
Total: 7562020 3155784 4406236
Current Disk Usage
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 222G 15G 196G 7% /
/dev/sda1 251M 21M 217M 9% /boot
tmpfs 1.7G 0 1.7G 0% /dev/shm
/usr/tmpDSK 485M 460M 0 100% /tmp
Following is statstics from XCache
Caches: - Slots Size Avail % Clear Compiling Hits Misses Clogs OOMs Protected Cached Deleted GC
php#0 8.00 K 64.00 M 36.81 M no 83,690 985 10 0 no 976 0
php#1 8.00 K 64.00 M 38.20 M no 111,389 1,005 10 0 no 999 0
var#0 8.00 K 8.00 M 7.97 M - 0 0 0 0 no 0 0 29
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2 Comments
Hi,
From what you've posted here I can not see any problem. It seems that your memory is OK. IT is normal that buffers take up so much space and levave very little free memory. But then again they are usable.
Data from your caches are also OK they say that you get 112556 hits but 1046 misses and 1040 of thm placed in the cache while your cache still runs at 60%.
Also your SWAP is empty if it was full it would indicate that you had semoe memory issues but my view on memory is also supprted by this also.
When it comes to your Web Statistics. IT indicates taht more than 18 hours of runtime and CPU is sitting idle 91 % with all the activity happens in apache (60 %) with 1,5 % System activity.
It also shows that there are 40 instances with stiell one request needs andother instance so that there's a new creation request.
I'll suggest you to install the package called systat. anc check sar and iostat activity. I wonder how much oh the 60% activity is consumed by HTTP and how much of it requesting file I/O. When you launch iostat the first row will give you the cumulated average actvity like sar.
In fact I guess that you must have your bottlenecks on server instances. You might like to reduce the numbers in your apache configuration. The initial server instances and minimum available sparse servers.
<IfModule prefork.c>
StartServers 100
MinSpareServers 40
MaxSpareServers 80
ServerLimit 1024
MaxClients 2048
MaxRequestsPerChild 4000
</IfModule>
Also your keepalive settings. It seems that al your instances are at the keepalive. (waiting for additional requests for each instance) Shorten them:
MaxKeepAliveRequests 20
KeepAliveTimeout 15
After you've installed the systat package check iostat also and if you feel there's a bottleneck in I/O then install additional hard disks with disk striping so that it would speed up the I/O.
yum install sysstat
iostat 5 5
sar -q 5 5
Please note the runq-sz column in sar it should be aorund 0 - 2 in an mildly loaded system but greater on busy systems.
Cheers,
K.
From what you've posted here I can not see any problem. It seems that your memory is OK. IT is normal that buffers take up so much space and levave very little free memory. But then again they are usable.
Data from your caches are also OK they say that you get 112556 hits but 1046 misses and 1040 of thm placed in the cache while your cache still runs at 60%.
Also your SWAP is empty if it was full it would indicate that you had semoe memory issues but my view on memory is also supprted by this also.
When it comes to your Web Statistics. IT indicates taht more than 18 hours of runtime and CPU is sitting idle 91 % with all the activity happens in apache (60 %) with 1,5 % System activity.
It also shows that there are 40 instances with stiell one request needs andother instance so that there's a new creation request.
I'll suggest you to install the package called systat. anc check sar and iostat activity. I wonder how much oh the 60% activity is consumed by HTTP and how much of it requesting file I/O. When you launch iostat the first row will give you the cumulated average actvity like sar.
In fact I guess that you must have your bottlenecks on server instances. You might like to reduce the numbers in your apache configuration. The initial server instances and minimum available sparse servers.
<IfModule prefork.c>
StartServers 100
MinSpareServers 40
MaxSpareServers 80
ServerLimit 1024
MaxClients 2048
MaxRequestsPerChild 4000
</IfModule>
Also your keepalive settings. It seems that al your instances are at the keepalive. (waiting for additional requests for each instance) Shorten them:
MaxKeepAliveRequests 20
KeepAliveTimeout 15
After you've installed the systat package check iostat also and if you feel there's a bottleneck in I/O then install additional hard disks with disk striping so that it would speed up the I/O.
yum install sysstat
iostat 5 5
sar -q 5 5
Please note the runq-sz column in sar it should be aorund 0 - 2 in an mildly loaded system but greater on busy systems.
Cheers,
K.
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