jsmem - JavaScript memory benchmark results

Browser Comparison

Here are the results of various browsers running on the same system: a Core 2 Duo E8500 (3.16 GHz). Bandwidth values are in GB/second. Entries are sorted by highest bandwidth.

Browser	OS	L1	L2	Main Memory
Chrome 15.0.874.102 beta, typed arrays	Windows XP 32-bit	14.0	11.75	5.23
Firefox 8.0 beta, typed arrays	Windows XP 32-bit	4.06	4.0	3.7
Firefox 4.0b11, typed arrays	Windows XP 32-bit	3.4	3.28	3.15
Firefox 4.0b11	Windows XP 32-bit	3.2	3.14	3.02
Midori 0.2.9	Linux 64-bit	2.1	2.09	2.03
Opera 11	Windows XP 32-bit	1.73	1.69	1.64
Safari 5.0.3	Windows XP 32-bit	1.53	1.63	1.59
Chrome 10.0.648.82	Windows XP 32-bit	1.5	0.8	0.4
Chrome 10.0.648.82	Linux 64-bit	0.55	0.35	0.2
Firefox 3.6.13	Windows XP 32-bit	0.75	0.72	0.72
IE 8	Windows XP 32-bit	0.085	0.085	0.085
C version	Linux 64-bit	34.9	21.3	5.3

The real bandwith of this system is 34.9/21.3/5.3 GB/sec as measured with a C version of the benchmark. Before testing Chrome 15, my conclusion was:
The best JavaScript result is about 60% of that in main memory, but only 10% in the L1 cache. So there's a lot of room for improvements.
This has changed now - with typed arrays, Chrome 15 gets the same performance as C in main memory, and 40-50% in the caches.

Different Systems

Normally, only the best result for each system is included.

CPU	OS	Browser	L1	L2	L3	Main Memory
Phenom X6 1090T, 3600 MHz?	Linux 64-Bit	Midori 0.2.9	2.22	2.17	2.13	2.04
AMD Turion X2 TL-62, 2.1 GHz	Windows XP 32-bit	Firefox 4.0b11	1.66	1.22	-	1.14
AMD Turion X2 TL-62, 2.1 GHz	Linux 64-bit	Midori 0.2.9	1.0	0.93	-	0.9

If you have interesting results to share, please mail me the raw results and your system info (to chbreitkopf@gmail.com). In particular, I would like to see some results from IE 9.