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Why does Java's hashCode() in String use 31 as a multiplier?
... I think the choice of 31 is rather unfortunate. Sure, it might save a few CPU cycles on old machines, but you have hash collisions already on short ascii strings like "@ and #! , or Ca and DB . This does not happen if you choose, for instance, 1327144003, or at least 524287 which also allows bitsh...
Animated GIF in IE stopping
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spin.js unfortunately is quite CPU intensive. See issues/8, issues/200, issues/215
– user247702
Aug 13 '15 at 14:00
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When would I use XML instead of SQL? [closed]
...nt of time. This only could be worked around with a costy (in the terms of CPU time) prebuffering with huge memory requirements.
– mg30rg
Nov 28 '13 at 8:43
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Grepping a huge file (80GB) any way to speed it up?
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If you have a multicore CPU, I would really recommend GNU parallel. To grep a big file in parallel use:
< eightygigsfile.sql parallel --pipe grep -i -C 5 'db_pd.Clients'
Depending on your disks and CPUs it may be faster to read larger blocks:
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A cron job for rails: best practices?
... How to prevent others from access this task ? If the task taking cpu and called it frequently will cause problems.
– sarunw
Dec 12 '09 at 15:02
44
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Joins are for lazy people?
...out joins. BUT in many cases, your development time is more important than CPU time and memory. Give up a little performance and enjoy your life. Don't waste your time for little little performance. And tell him "Why don't you make a straight highway from your place to your office?"
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How do I automatically update a timestamp in PostgreSQL
... Says so in the Postgres documentation of the types. Varchar has extra CPU cycles to check for the constraint, which doesn't happen on TEXT.
– Rahly
Jun 21 '17 at 15:50
3
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What does 'synchronized' mean?
...queue and starts executing. In the above example, THREAD 3 happened to get CPU before THREAD 2.
– Sahil J
Apr 7 '17 at 6:07
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Formula to determine brightness of RGB color
... if you do it as: Y = (R<<1+R+G<<2+B)>>3 (thats only 3-4 CPU cycles on ARM) but I guess a good compiler will do that optimisation for you.
– rjmunro
Mar 11 '15 at 11:16
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How to download image using requests
... images already have their own compression. It's counterproductive, wastes CPU cycles with little benefit. So while this may be an issue with text content, specifically with images it's not.
– phette23
Sep 11 '14 at 4:19
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