77272 2012-01-27 23:11:06 -0800 FileReader read speed is way too low 2012-03-02 09:23:01 -0800 1 1 1 Unclassified WebKit DOM 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 0 craigyk ap ap oldest_to_newest 544621 0 craigyk 2012-01-27 23:11:06 -0800 I've found that the read speed using FileReader seems to be artifically throttled to ~8MB/sec. The same code in Chrome gets much faster speeds (reading from an SSD, 100MB/sec+). I know the FileReader isn't complete yet, but I thought the heads up might be nice... this speed limitation is currently the bottleneck in the resumable uploader I'm building... I've gotten the MD5 hashing speed up to 20MB/sec/thread in JS. I'm hoping for confirmation that my interpretation is correct (that it's throttled), and to give a heads up on this performance limitation. I recognize that FileReader in the nightly isn't production-ready yet. 568860 1 129739 ap 2012-03-01 13:27:59 -0800 Created attachment 129739 poposed fix 568952 2 ap 2012-03-01 14:51:35 -0800 Committed <http://trac.webkit.org/changeset/109435>. 569703 3 craigyk 2012-03-02 09:23:01 -0800 Wow, it's somehow magically ~512X faster now! J/K, but it is much better, I'm getting read speeds of ~45MB/sec now from the SSD vs. the previous ~8. Thanks! 129739 2012-03-01 13:27:59 -0800 2012-03-01 13:30:21 -0800 poposed fix SlowFileReader.txt text/plain 1321 ap SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDEwOTQwNCkKKysrIFNvdXJjZS9XZWJDb3JlL0NoYW5n ZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDE1IEBACisyMDEyLTAzLTAxICBBbGV4ZXkg UHJvc2t1cnlha292ICA8YXBAYXBwbGUuY29tPgorCisgICAgICAgIEZpbGVSZWFkZXIgcmVhZCBz cGVlZCBpcyB3YXkgdG9vIGxvdworICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93 X2J1Zy5jZ2k/aWQ9NzcyNzIKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4K KworICAgICAgICBUaGlzIGJyaW5ncyBwZXJmb3JtYW5jZSB0byByZWFzb25hYmxlIHJhbmdlLCBi dXQgY2VydGFpbmx5IGRvZXNuJ3QgZXhoYXVzdCBpbXByb3ZlbWVudCBvcHBvcnR1bml0aWVzLgor CisgICAgICAgICogcGxhdGZvcm0vbmV0d29yay9CbG9iUmVzb3VyY2VIYW5kbGUuY3BwOiBVc2Ug YSBtb3JlIGFwcHJvcHJpYXRlIGJsb2NrIHNpemUuIFBlcmZvcm1pbmcKKyAgICAgICAgY3Jvc3Mt dGhyZWFkIG1lc3NhZ2luZyBmb3IgZXZlcnkgMTAyNCBieXRlcyBpcyBzbG93LgorCiAyMDEyLTAz LTAxICBLYW5naWwgSGFuICA8a2FuZ2lsLmhhbkBzYW1zdW5nLmNvbT4KIAogICAgICAgICBbRFJU XSBSZW1vdmUgYWxsIFBsYWluVGV4dENvbnRyb2xsZXIgdXNhZ2VzIGluIGV4aXN0aW5nIHRlc3Rz IGJ5IGFkZGluZyBpbnRlcm5hbCBBUEkKSW5kZXg6IFNvdXJjZS9XZWJDb3JlL3BsYXRmb3JtL25l dHdvcmsvQmxvYlJlc291cmNlSGFuZGxlLmNwcAo9PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2ViQ29y ZS9wbGF0Zm9ybS9uZXR3b3JrL0Jsb2JSZXNvdXJjZUhhbmRsZS5jcHAJKHJldmlzaW9uIDEwOTM2 MCkKKysrIFNvdXJjZS9XZWJDb3JlL3BsYXRmb3JtL25ldHdvcmsvQmxvYlJlc291cmNlSGFuZGxl LmNwcAkod29ya2luZyBjb3B5KQpAQCAtNDgsNyArNDgsNyBAQAogCiBuYW1lc3BhY2UgV2ViQ29y ZSB7CiAKLXN0YXRpYyBjb25zdCB1bnNpZ25lZCBidWZmZXJTaXplID0gMTAyNDsKK3N0YXRpYyBj b25zdCB1bnNpZ25lZCBidWZmZXJTaXplID0gNTEyICogMTAyNDsKIHN0YXRpYyBjb25zdCBsb25n IGxvbmcgcG9zaXRpb25Ob3RTcGVjaWZpZWQgPSAtMTsKIAogc3RhdGljIGNvbnN0IGludCBodHRw T0sgPSAyMDA7Cg==