Thanks for the response.
Can I avoid or lessen that worker threads delay the JavaScript main thread?
4 CPU cores exists and HT supported.
(I think ... the priority of main thread set to higher, ...?)
Toru Nagashima.
2012年12月5日水曜日 19時27分09秒 UTC+9 Dan Milon:
>
> It doesnt look like they wait for the previous ones to complete.
> Its just more load, so the threads queue up, hence the high latencies.
>
> danmilon.
>
> On 12/05/2012 12:24 PM, 長島徹 wrote:
> > Hello.
> >
> > I found a strange behavior. I want to get the method to avoid the
> > behavior.
> >
> > I compress a data (around 1.8MB) with ZLib. result:
> >
> > ok(84ms): 0_data.json.gz
> >
> >
> > OK, the process finished on around 100ms. I tried to compress the
> > data in parallel 50. Having done that, all processes were slow
> > similarly. result:
> >
> > ok(987ms): 3_data.json.gz ok(1002ms): 4_data.json.gz ok(1002ms):
> > 8_data.json.gz ok(1004ms): 0_data.json.gz ok(1004ms):
> > 2_data.json.gz ok(1003ms): 5_data.json.gz ok(1002ms):
> > 10_data.json.gz ok(1003ms): 6_data.json.gz ok(1004ms):
> > 1_data.json.gz ok(1002ms): 13_data.json.gz ok(1003ms):
> > 7_data.json.gz ok(1002ms): 9_data.json.gz ok(1002ms):
> > 11_data.json.gz ok(998ms): 21_data.json.gz ok(1001ms):
> > 16_data.json.gz ok(1003ms): 12_data.json.gz ok(1002ms):
> > 17_data.json.gz ok(1003ms): 14_data.json.gz ok(999ms):
> > 20_data.json.gz ok(999ms): 24_data.json.gz ok(1002ms):
> > 18_data.json.gz ok(999ms): 19_data.json.gz ok(998ms):
> > 26_data.json.gz ok(999ms): 23_data.json.gz ok(1002ms):
> > 15_data.json.gz ok(999ms): 25_data.json.gz ok(999ms):
> > 28_data.json.gz ok(999ms): 29_data.json.gz ok(999ms):
> > 30_data.json.gz ok(1000ms): 22_data.json.gz ok(998ms):
> > 33_data.json.gz ok(998ms): 32_data.json.gz ok(998ms):
> > 35_data.json.gz ok(998ms): 38_data.json.gz ok(999ms):
> > 31_data.json.gz ok(998ms): 36_data.json.gz ok(997ms):
> > 44_data.json.gz ok(997ms): 42_data.json.gz ok(997ms):
> > 39_data.json.gz ok(998ms): 34_data.json.gz ok(997ms):
> > 40_data.json.gz ok(998ms): 37_data.json.gz ok(997ms):
> > 41_data.json.gz ok(997ms): 43_data.json.gz ok(999ms):
> > 27_data.json.gz ok(996ms): 48_data.json.gz ok(996ms):
> > 45_data.json.gz ok(997ms): 46_data.json.gz ok(997ms):
> > 47_data.json.gz ok(996ms): 49_data.json.gz
> >
> >
> > Each process returned after done all processes. Why is this? And
> > what do I do to avoid this behavior?
> >
> > I had expected that the finished process returns immediately in
> > turn. eg:
> >
> > ok(100ms): 3_data.json.gz ok(100ms): 4_data.json.gz ok(100ms):
> > 8_data.json.gz ok(100ms): 0_data.json.gz ok(100ms): 2_data.json.gz
> > ok(200ms): 5_data.json.gz ok(200ms): 10_data.json.gz ok(200ms):
> > 6_data.json.gz ok(200ms): 1_data.json.gz ok(200ms):
> > 13_data.json.gz ok(300ms): 7_data.json.gz ok(300ms):
> > 9_data.json.gz ok(300ms): 11_data.json.gz .... ....
> >
> >
> >
> > Sorry my poor English. Thanks.
> >
> > P.S. test program
> >
> >
> > 'use strict';
> >
> > var Fs = require('fs'); var Z = require('zlib');
> >
> > var target = 'data.json'; var times = 50;
> >
> > var dumpEnd = function (name, begin) { return function () {
> > console.log('ok(' + (Date.now() - begin) + 'ms): ' + name); }; };
> >
> > for (var i = 0; i < times; ++i) { var zipName = i + '_' + target +
> > '.gz'; var begin = Date.now();
> >
> > Fs.createReadStream(target) .pipe(Z.createGzip())
> > .pipe(Fs.createWriteStream(zipName)) .on('close', dumpEnd(zipName,
> > begin)); }
> >
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