memcached for win32, new java api
gwhalin at meetup.com
Mon Nov 29 15:12:14 PST 2004
Gregory Block wrote:
> On 29 Nov 2004, at 17:20, Evan Martin wrote:
>> I randomly stumbled across this:
>> which indicates they've almost got memcached building on win32 (why? not
>> sure...), as well as a "more adventurous" Java client that uses
>> connection pools, worker threads, etc. for better performance.
> Oh, yes. I did quite a bit of work on it. Then it got utterly stomped
> on, performance-wise, by the work done by meetup.
Glad to hear this.
> Mind you, I'm not using it as-is; the Meetup client has one of the same
> problems I had in the beginning, which is with the assumption that
> get-multi will only be used in a single-threaded manner.
Here I am confused? We don't make any assumption about this running in
a single thread. Since we are pulling all sockets from a pool, this
method should be as easily parallelized as any other method in the
client. Are you saying you have found a case where our client is not
thread safe? If so, please, by all means let me know. I can say that we
run the client in a pretty heavily parallelized environment with a
single instance and have had no problems, but tracking threading bugs
can always be a bit tricky, so if you know something we don't, share the
A nice thing about using a connection pool and a parallelized
environment, is that there is much less of a benefit to using getMulti()
(you save a bit in network bandwidth at the cost of more
parallelization). This is of course, assuming no optimizations on the
server side to using getMulti(), which I honestly have to profess my
ignorance. Anyhoo, this is a bit off topic.
> However, the easiest way I've found of managing this is to actually just
> go ahead and create an object pool of memcached clients, and grab one
> out of the pool every time I need one in order to supply myself with the
> level of parallelism required.
Again, we only ever have one instance of the client, which uses a pool
of sockets. If you are only ever gonna have one connection open to the
server, then a pool of clients should work as well.
greg at meetup.com
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