gm vs canvas przy generowaniu miniaturek

aaa.md

Na wstępie:

• gm spawnuje procesy więc wykorzystuje wszystkie rdzenie (w teście 4)
• canvas działa jako biblioteka node więc tylko w procesie node (tylko 1 rdzeń)
• lepiej dostarczać node-canvas odczytany plik (buffer) niż nazwę pliku
• zużycie RAMu prze node-canvas nie przekraczało 300 MB (nawet przy -c 500)

node-canvas miażdży gm :)

https://github.com/LearnBoost/node-canvas

node-canvas1.js

var http = require("http"),
	Canvas = require('canvas'),
	fs = require('fs')

http.createServer(function (req, res) {
	res.writeHead(200, {"Content-Type": "image/jpeg"});
	
	var canvas = new Canvas(100,100),
		ctx = canvas.getContext('2d');
	
	fs.readFile('image.jpg', function(err, file){
		if(!err) {
			var img = new Canvas.Image;
			img.src = file;
			ctx.drawImage(img, 0, 0, 100, 100);
			canvas.createJPEGStream().pipe(res);
		} else {
			res.end();
		}
	});
	
}).listen(9293, "0.0.0.0");

node-canvas1_results.txt

Concurrency Level:      100
Time taken for tests:   11.144 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      3051000 bytes
HTML transferred:       2987000 bytes
Requests per second:    89.74 [#/sec] (mean)
Time per request:       1114.378 [ms] (mean)
Time per request:       11.144 [ms] (mean, across all concurrent requests)
Transfer rate:          267.37 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.5      0       2
Processing:    90 1065 173.1   1106    1270
Waiting:       87 1063 173.1   1104    1267
Total:         92 1065 172.7   1106    1270


user    0m10.964s
sys     0m0.335s

node-gm_results.txt

Concurrency Level:      100
Time taken for tests:   16.390 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      2554000 bytes
HTML transferred:       2490000 bytes
Requests per second:    61.01 [#/sec] (mean)
Time per request:       1638.968 [ms] (mean)
Time per request:       16.390 [ms] (mean, across all concurrent requests)
Transfer rate:          152.18 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    2   8.7      0      52
Processing:   176 1622 402.9   1583    3171
Waiting:      176 1421 430.7   1505    3087
Total:        178 1624 403.8   1583    3171



user    0m59.760s
sys     0m2.968s

znode-canvas1_results-gratis.txt

Gratis :)

Concurrency Level:      500
Time taken for tests:   110.762 seconds
Complete requests:      10000
Failed requests:        0
Write errors:           0
Total transferred:      30510000 bytes
HTML transferred:       29870000 bytes
Requests per second:    90.28 [#/sec] (mean)
Time per request:       5538.097 [ms] (mean)
Time per request:       11.076 [ms] (mean, across all concurrent requests)
Transfer rate:          269.00 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    1   1.7      0      12
Processing:   145 5405 659.8   5531    5716
Waiting:      143 5402 659.8   5529    5716
Total:        156 5405 658.2   5531    5721


user    1m49.712s
sys     0m2.045s