SABnzbd Forums

Hi forum

I recently purchased a Synology DS212+ storage box. Installing and configuring SABnzbd was a breeze, but I'm still having some performance issues. I'm only reaching about 3MB/s download speeds, which is about half the speed that I used to get on my windows-based, much more powerful laptop.

Basically, as soon as I begin a new download, my resource monitor displays 100% CPU usage. Most of which is caused by the python package provided by syno community. I guess this is creating a bottleneck effect, forcing SABnzbd to download at a slower pace.

I googled around for a few hours, but there doesn't seem to be much concrete information on this subject. Some suggested installing the C based yenc package (I believe it's called py25-yenc), which I did through ipkg. I didn't notice any immediate download speed increase though. I've also changed the maximum amount of connections down from 50 to 10, but still no dice. I connect to my usenet provider (newsdemon) using SSL encrypted connections on port 563. I don't think my server settings are the problem though, my computer doesn't have any problem downloading.

Is there anything I should be doing differently? All suggestions are welcome.
Steven

The only extra thing you can do is set an article cache in Config->General.
Your system needs to have plenty if memory (at least 512M)
and the influence is different per system.
Set it to something like 128M.

Thanks for the suggestion.

What is the default cache size? Or does it not use a cache unless explicitly set? The web interface doesn't really show.

For Linux systems, there's no default, so empty box means: no cache.

Alright thank you. At the end of the day, none of these tweaks really seem to do anything on a synology NAS. I guess that a fast CPU is a minimum requirement before you can start fine-tuning things.

I'm afraid you're right about that.
CPU usage is SABnzbd's weak spot.

I'm running SAB on linux box with Intel Dual Core 2,6Ghz and when I leave SAB "unleashed" CPU usage goes over 50%. My connection is 35Mbit/s and if I reduce the speed in SAB to 4096kbit/s (4MB/s) which is almost my max speed CPU usage drops to 15-20ish %. Correct me if I'm wrong but Python is not using dual cores or?

As far as I know, Python is single-core.
Its multi-threading architecture doesn't make the OS use multiple cores for it.

bbaraniec wrote:I'm running SAB on linux box with Intel Dual Core 2,6Ghz and when I leave SAB "unleashed" CPU usage goes over 50%.

Depends on your source for that percentage. Some utilities in linux, such as ps and top, present cpu usage of processes as a percentage of single core performance, without division by the total number of cpu cores available. For example, on a dual core system, with a single core application maxing out one of the cores (cpuburn style), that application's cpu usage would be indicated as ~100% in such utilities although it represents only half the cpu power available.