lshttpd using constant CPU even when not in use

[closet geek]

Hi,

We are using lsws, but it is not yet active in the sense that it is serving any pages. I note that the lshttpd process is still consuming between 0.7%-1.5% CPU at all times even though LiteSpeed is not serving any content at all.

I straced the process and I see the problem is this file:

/tmp/lshttpd/.rtreport

Is constantly being written to (literally always). This seems to be throttling related, however as this is causing overhead on both CPU and disk can it be stopped?

Thanks.

 

[mistwang]

LSWS update the real time status via that file regularly, we may change it to another way to provide the information on demand in the future.
So, it is not possible to turn it off now, however, if you want to avoid disk operation, you can mount a small ram disk at /tmp/lshttpd/ .

 

[closet geek]

Thanks for your reply. I would say it's odd that the real time stats are updated to 0 constantly instead of an update being triggered when a connection is made (e.g. how the access logs work).

 

[anewday]

Yeah, I think it's best to change how it updates. Less disk writes are better.

 

[closet geek]

LSWS update the real time status via that file regularly, we may change it to another way to provide the information on demand in the future.

Is this a definite change for a future 4.0 beta? I really dislike unnecessary disk usage and logging that nothing is happening is definitely unnecessary!

 

[anewday]

He said it will be changed in 4.0 versions.

 

[anewday]

Has this been changed in the latest 4.0 beta?

 

[mistwang]

No, it has not been changed yet.

 

[anewday]

Hope you find a solution to this, it just doesn't sit well with me that the hdd is constantly being written to.

 

[mistwang]

temp solution is simple, mount a RAM disk at /tmp/lshttpd , move swapping directory from /tmp/lshttpd/swap to somewhere else.

 

[anewday]

I only changed Swapping Directory to /dev/shm or should it be /dev/shm/swap ? Is this enough?

 

[anewday]

Any updates to this?

 

[TomBG]

I only changed Swapping Directory to /dev/shm or should it be /dev/shm/swap ? Is this enough?

That's swap, not a RAM disk.

 

[anewday]

But it's loading from memory, no?

 

[TomBG]

But it's loading from memory, no?

No. Not if it's just a typical swap file/drive/partition. A RAM disk is something completely different. In FreeBSD they're referred to as "memory disks" and work like other mount points except you're allocating RAM to create a drive instead of pointing to a physical drive. I'm not sure what OS you're running but you might want to "man mount".

 

[anewday]

http://www.litespeedtech.com/support/forum/showthread.php?t=2814&page=3

So, how does that help if it's still loading from the drive?

 

[anewday]

George, I was thinking that it's a good idea to add an option to disable real-time stats. I would venture to say that most don't use it that much. They can enable it when needed.

 

[anewday]

George, have you thought about disabling real-time stats option?

 

[GaryT]

where in the options within WHM plugin is that - I looked and could not find it - I have LSWPHP5 high loads - Alot of them at times and I do think the logs could be an issue.

 

[mistwang]

George, have you thought about disabling real-time stats option?

It will be served via a special URL when required, like mod_status in Apache.