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Groups > comp.lang.java.programmer > #18632
| From | qwertmonkey@syberianoutpost.ru |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | greatly differing processing time between java and Linux while calculating hashes? |
| Date | 2012-09-10 01:45 +0000 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <k2jgo0$ocg$1@speranza.aioe.org> (permalink) |
> As far as I could extract from that code (which I find pretty badly readable btw.) you are measuring digest calculation and IO. ~ Well, if I understand you, you will have to read in the file you are checksumming anyway, right? ~ I used FileInputStream's read(byte[]) method in a straight forward way, which is, byte[], what you must feed a MessageDigest's update method. So, what do you mean? ~ > What measures did you take to ensure there are no effects from OS buffering? ~ What do you mean? What extra measure should I take to ensure there are no effects from OS buffering? ~ > Also, why are you comparing apples (Java) and oranges (Linux) - at > least in the subject? ~ Because I am trying to extract sugar from them in the most efficient way ~ > Are you aware that the JVM has some startup time > which can be significant when measuring run once applications? ~ Yes, and this is why I am just timing the method call and testing different block sizes for the buffer ... ~ Still guys (to me) a difference of more than 25% in processing time is significant and I don't think that what you consider to be my odd style to code is causing it ~ lbrtchx
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greatly differing processing time between java and Linux while calculating hashes? qwertmonkey@syberianoutpost.ru - 2012-09-10 01:45 +0000 Re: greatly differing processing time between java and Linux while calculating hashes? Roedy Green <see_website@mindprod.com.invalid> - 2012-10-13 15:12 -0700
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