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Heapsize for Wowza!

Posted on 2014-02-20
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Last Modified: 2014-03-03
Hi All,

I have the Wowza streaming server with spec (using VPS):
- 04 CPUs
- RAM 16GB
- HDD: 500GB, 7.2 rpm
- NIC: 01Gbps
- Internet (NIX): 512Mbps

The only parameter that I configured:
- Heapsize: 5000M

After I checked this server on the system with tools: htop, top, free & others, I got the information:
- CPU: ~5%
- RAM: ~12-13GB used; ~2-3GB free
- Each connection connects to this server, it occupied RAM ~600M
- Connection concurrent users (CU): ~200
(Sometimes, I must clear cahce/ram with "sync; echo 3 > /proc/sys/vm/drop_caches")

So, I have questions for this isuse:
1. How to adjust the Heapsize with 16GBRAM? If I up to 32GBRAM, what's the Heapsize or other parameters?
2. Can I decrease the memory that each connection occupy RAM? (Currently, it occupied ~600M)
3. The system needs:
 - 500 CU at the same time, what about RAM for the streaming server?
 - 1000 CU at the same time, what about RAM for the streaming server?
4. What parameters that I can tune for the streaming server?
5. CPU is OK for this server if the system have more than 1000 CU at the same time?

Please give me your advices about issues above.

Thanks in advances.
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Question by:ldvhai
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Expert Comment

by:gheist
ID: 39880467
Somebody been there done that:
http://www.wowza.com/forums/content.php?46-General-Performance-Tuning
Basically if "vendor recommendations" seem insufficient you get into black art of tuning.
5GB of java heap seems a lot for streaming. I'd start with 1G and rise if catching OOM
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Author Comment

by:ldvhai
ID: 39880473
Thanks for your anwser, I also have read this link before.

LDVHAI.
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Accepted Solution

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gheist earned 500 total points
ID: 39880481
Normally you dont clean the cache on Linux.
Normally you can tune how cache is released using sysctl vm.???? and watching result with slabinfo.

As first tip to stop swapping vm.swappiness=0 vm.vfs_cache_pressure=1000
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Author Comment

by:ldvhai
ID: 39880527
Hi Gheist,

Thanks for your information.

Please give your explain below, if you can.

swapping vm.swappiness=0
vm.vfs_cache_pressure=1000

Many Thanks for your help.

LDVHAI.
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Assisted Solution

by:gheist
gheist earned 500 total points
ID: 39880576
Your system has this document too:
https://www.kernel.org/doc/Documentation/sysctl/vm.txt

Based on icecast server ram usage - you need about nothing per connection (like 100KB or so)
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Author Comment

by:ldvhai
ID: 39880621
Thanks so much for your help.
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Author Closing Comment

by:ldvhai
ID: 39900533
Thanks for your anwser.
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