[solved] Difference between 2 cpu, 4cpu and 8cpu?

[roycerus]

Hi,
I just installed litespeed. My admin says that we need to get only a 2 core license as we are using the amazon cdn and 2 core would be enough to deliver the data - in any case the rest of the 6 cores will be used to process php.

I am unsure if that is the best option. What exactly is the difference between a 2 core, 4 core and 8 core license - I know it says that it's optimized for 8 core. But what kind of optimization and results can I see if I invest more to get the 8 core license?

We are heavy php user and my server is a dedicated http server - quad core Intel(R) Xeon(R) CPU E5320 @ 1.86GHz

Kindly clarify.

Regards,
Roycerus

[NiteWave]

please refer our wiki:
http://www.litespeedtech.com/support...ense_to_choose

if any more question, come back here.

[roycerus]

My Server serves a LOT of files which are stored in an NFS. It's a vbulletin installation which serves the files through attachment.php?attachid=NUM

Does this constitute as file download or something else?

The cores which are being used by LSWS - are they also available for php processing if needed?

Will getting a 8 core license give me more FLEXIBILITY to serve files quickly and also serve php depending on user connections and current needs?

I have a dedicated mysql server - so the only processes running on the server is lsws and postfix. Given the scenario - I am thinking perhaps I should go with a 4 core / 8 core license - what do you think?

[NiteWave]

>Does this constitute as file download or something else?
should be file download

>The cores which are being used by LSWS - are they also available for php processing if needed?
yes. actually it's decided by kernel.

to enable lsws page cache for vBulletin, need 2-CPU(or above) license. between 2/4/8-CPU license, which is best for your site and traffic, depending on many other factors. you can switch between these licences, to watch the performance for a few days, to get the best answer from yourself.

for upgrade/downgrade license,please refer:
http://www.litespeedtech.com/support...ngrade_license

[roycerus]

I have 2 cpu enterprise trial installed - if I buy a 4 cpu license would I need to get it reinstalled or will just updating the serial key work?

[NiteWave]

serial.no no change. no need re-install. as stated in the wiki:

Your license will be updated from our license server automatically once invoice is paid. Your local license key will be auto-updated within one day. If you want it to become effective immediately, Please run following commands to retrieve a new license key,

/usr/local/lsws/bin/lshttpd -r
/usr/local/lsws/bin/lswsctrl restart
assuming LSWS is installed to /usr/local/lsws.

this is all you need do when upgrade/downgrade. it's convenient.

[roycerus]

Thanks for your help Nitewave. I am running the 4 core license now. It's super!

[roycerus]

One more question - how would you measure high io? Does it show in top?

[NiteWave]

run
#iostat -x
check %iowait and %util

[roycerus]

I just ran into a "Prefetching is not allowed due to the various privacy issues that arise." on both firefox and chrome. This has never happened before. Could this be related to the Litespeed cache?