Re: Threads, Sockets and OSX

Hi Peter,

I am writing an application that must run on a Linux server where i 
can't install what i want.
I am developing it under FreeBSD, my machine, where i am free to install 
stuff.

I observed important differences in the performance (and bugs) of the 
app running on the server with an old Ruby
and on my machine with a recent Ruby.

So, the first thing you may check is: are the two Ruby version the same ?
Preinstalled versions of Ruby tend to be VERY old.

After a while, to ensure the same behaviour on different OSes I moved 
the app to JRuby.

Now it is all very consistent, I am happy with that.

You may try JRuby as well, it is trivial to get it working provided you 
have
a recent (1.8) version of Java installed. You don't need root.


bye
n.





On 12/5/18 11:33 AM, Peter Hickman wrote:
> I have a little app that is basically the standard threaded TCPServer 
> with a couple of mutexes to implement a fifo queue. When it runs it 
> goes flat out for 15-20 seconds and then freezes for 10-15 seconds. 
> Everything resumes just fine but it's a bit annoying and occasionally 
> the freeze lasts long enough to timeout connections to the server
>
> My first thought was the GC was kicking in and so I have been trying 
> to find ways to reduce the amount of GC that needs to be done as well 
> as calling it when I have created or deleted structures so that it 
> does not accumulate a pile of work and kick in unexpectedly
>
> This has reduced the number of times that the timeout causing freezes 
> have happened but not affected the other freezes and has also reduced 
> the throughput
>
> This is on a MacMini with 4 CPUs and 8 GB ram
>
> After much fiddling with data structures and the like I just decided 
> to run this on a Debian box with 4 CPUs and 4 GB of ram
>
> No freezes whatsoever! Not even a little one. Throughput jumps from 
> 500-700 puts/gets per second to 1,000 to 1,500
>
> Where is the problem with OSX
> 1) Threads
> 2) Sockets
> 3) Mutexes
>
> Anyone seen something like this before?
>
>
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