Is your app written to be non-blocking? You mentioned converting an existing app; is that app written to use an event loop and asynchronous event execution? On 17 November 2015 at 15:48, David H <untg99@gmail.com> wrote:
Thanks for the response, I think my original email basically outlined my issue, but I will break it down.
If 10 people visit my page at the moment, and the page has to retrieve database/memcached info for the 10 people, and it takes 1 second to do all the pre-work to load the page, then each of those requests for each person, is done separately, taking a total of 10 seconds for the last person to retrieve their data, since it has to wait for each other process to finish before attending to the next person.
At a basic level in nodejs, you do this (as an example):
router.get('/', function (req, res, next) { Post.find(function(err, Patients) { if (err) { return next(err) } res.json(People) },'Firstname Surname') })
And although this is per session blocker in node, it still allows other sessions to continue. I want to know how to achieve this or a similar effect in Dancer2. Or, do I just look at it as an issue with Perl and solve it through something like AnyEvent::Util::fork_call
David
On Wed, Nov 18, 2015 at 12:32 AM, Rick Leir <richard.leir@canadiana.ca> wrote:
On Tue, Nov 17, 2015 at 7:00 AM, <dancer-users-request@dancer.pm> wrote:
delayed { my $TextToWrite = ReturnText(); sleep(10); # Do something that takes a few seconds content "$TextToWrite"; done; };
The sleep call will always cause blocking, even a sleep(0). Likewise a flush. In the sense that there is a context switch to some other thread or process.
How are you testing whether it is blocking? Sorry, I do not know what you are trying to do.
Linux will not schedule a cpu intensive task to the exclusion of I/O. You can affect its scheduling using nice:
http://stackoverflow.com/questions/2012852/control-a-perl-scripts-cpu-utiliz...
If you really want nonblocking then you can look at nice for io http://linux.die.net/man/1/ionice or spawn a C program with pthreads and freeze your screen! cheers -- Rick
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