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Optimising Apache 2.2 mod-perl auto-scaled/load-balanced application
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I have perl application running in an AWS auto-scaling environment. At the moment it's using requests-per-target as the scaling trigger.
What I'm confused about is that the CPU usage on the instances is very low, consistently < 10%. The RAM utilisation is also quite low, typically around 40%.
Looking at these metrics, it seems the instances should be able to handle much higher load than what they are. However if I try to increase the requests-per-target threshold, thereby reducing the instance count, I start seeing random errors occurring.
I think I must have something not optimally configured in Apache, but I'm not sure what. I've inherited responsibility for this application, but I'm not very experienced with Apache or Linux optimisation.
This is what I have in the Apache config...
Timeout 130
KeepAlive On
MaxKeepAliveRequests 5
KeepAliveTimeout 125
<IfModule prefork.c>
MinSpareServers 10
MaxSpareServers 20
MaxRequestsPerChild 500
</IfModule>
Can anyone see anything that looks obviously problematic for an auto-scaling/load-balanced application?
If it helps, the instances are m4.2xlarge, 8 vCPU + 32GB.
If I check the load with uptime, this is also very low, < 0.5 average.
It really seems as though the servers are very under-utilised, so I can't quite understand why I'm unable to send more requests to them.
Any suggestions would be greatly appreciated.
apache-2.2 load-balancing autoscaling mod-perl
asked 3 mins ago
user1751825user1751825
200110
add a comment |
I have perl application running in an AWS auto-scaling environment. At the moment it's using requests-per-target as the scaling trigger.
What I'm confused about is that the CPU usage on the instances is very low, consistently < 10%. The RAM utilisation is also quite low, typically around 40%.
Looking at these metrics, it seems the instances should be able to handle much higher load than what they are. However if I try to increase the requests-per-target threshold, thereby reducing the instance count, I start seeing random errors occurring.
I think I must have something not optimally configured in Apache, but I'm not sure what. I've inherited responsibility for this application, but I'm not very experienced with Apache or Linux optimisation.
This is what I have in the Apache config...
Timeout 130
KeepAlive On
MaxKeepAliveRequests 5
KeepAliveTimeout 125
<IfModule prefork.c>
MinSpareServers 10
MaxSpareServers 20
MaxRequestsPerChild 500
</IfModule>
Can anyone see anything that looks obviously problematic for an auto-scaling/load-balanced application?
If it helps, the instances are m4.2xlarge, 8 vCPU + 32GB.
If I check the load with uptime, this is also very low, < 0.5 average.
It really seems as though the servers are very under-utilised, so I can't quite understand why I'm unable to send more requests to them.
Any suggestions would be greatly appreciated.
apache-2.2 load-balancing autoscaling mod-perl
asked 3 mins ago
user1751825user1751825
200110
add a comment |
I have perl application running in an AWS auto-scaling environment. At the moment it's using requests-per-target as the scaling trigger.
What I'm confused about is that the CPU usage on the instances is very low, consistently < 10%. The RAM utilisation is also quite low, typically around 40%.
Looking at these metrics, it seems the instances should be able to handle much higher load than what they are. However if I try to increase the requests-per-target threshold, thereby reducing the instance count, I start seeing random errors occurring.
I think I must have something not optimally configured in Apache, but I'm not sure what. I've inherited responsibility for this application, but I'm not very experienced with Apache or Linux optimisation.
This is what I have in the Apache config...
Timeout 130
KeepAlive On
MaxKeepAliveRequests 5
KeepAliveTimeout 125
<IfModule prefork.c>
MinSpareServers 10
MaxSpareServers 20
MaxRequestsPerChild 500
</IfModule>
Can anyone see anything that looks obviously problematic for an auto-scaling/load-balanced application?
If it helps, the instances are m4.2xlarge, 8 vCPU + 32GB.
If I check the load with uptime, this is also very low, < 0.5 average.
It really seems as though the servers are very under-utilised, so I can't quite understand why I'm unable to send more requests to them.
Any suggestions would be greatly appreciated.
apache-2.2 load-balancing autoscaling mod-perl
asked 3 mins ago
user1751825user1751825
200110
I have perl application running in an AWS auto-scaling environment. At the moment it's using requests-per-target as the scaling trigger.
What I'm confused about is that the CPU usage on the instances is very low, consistently < 10%. The RAM utilisation is also quite low, typically around 40%.
Looking at these metrics, it seems the instances should be able to handle much higher load than what they are. However if I try to increase the requests-per-target threshold, thereby reducing the instance count, I start seeing random errors occurring.
I think I must have something not optimally configured in Apache, but I'm not sure what. I've inherited responsibility for this application, but I'm not very experienced with Apache or Linux optimisation.
This is what I have in the Apache config...
Timeout 130
KeepAlive On
MaxKeepAliveRequests 5
KeepAliveTimeout 125
<IfModule prefork.c>
MinSpareServers 10
MaxSpareServers 20
MaxRequestsPerChild 500
</IfModule>
Can anyone see anything that looks obviously problematic for an auto-scaling/load-balanced application?
If it helps, the instances are m4.2xlarge, 8 vCPU + 32GB.
If I check the load with uptime, this is also very low, < 0.5 average.
It really seems as though the servers are very under-utilised, so I can't quite understand why I'm unable to send more requests to them.
Any suggestions would be greatly appreciated.
apache-2.2 load-balancing autoscaling mod-perl
apache-2.2 load-balancing autoscaling mod-perl
asked 3 mins ago
user1751825user1751825
200110
asked 3 mins ago
user1751825user1751825
200110
asked 3 mins ago
user1751825user1751825
200110
asked 3 mins ago
user1751825user1751825
200110
asked 3 mins ago
user1751825user1751825
200110
200110
add a comment |
add a comment |
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