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MySQL pagination without double-querying?
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In most situations it is much faster and less resource intensive to do it in two separate queries than to do it in one, even though that seems counter-intuitive.
If you use SQL_CALC_FOUND_ROWS, then for large tables it makes your query much slower, signi...
HTTPS setup in Amazon EC2
... certificate to it. This way you will benefit from both having a CDN for a faster content delivery and also securing you domain with HTTPS protocol.
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GPU Emulator for CUDA programming without the hardware [closed]
...ature of CUDA for quite some time, but the LLVM translator has always been faster.
Additionally, several correctness checkers are built into the emulator to verify: aligned memory accesses, accesses to shared memory are properly synchronized, and global memory dereferencing accesses allocated regio...
Aggregate / summarize multiple variables per group (e.g. sum, mean)
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Using the data.table package, which is fast (useful for larger datasets)
https://github.com/Rdatatable/data.table/wiki
library(data.table)
df2 <- setDT(df1)[, lapply(.SD, sum), by=.(year, month), .SDcols=c("x1","x2")]
setDF(df2) # convert back to dataframe
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What are the respective advantages/limitations of Amazon RDS vs. EC2 with MySQL? [closed]
... "cloud based" storage system failover is now very quick. Also it provides fast snapshots and backups. Aurora has really addressed many of the shortcomings of RDS MySQL.
– Jeff Whiting
Mar 24 at 16:49
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java.lang.OutOfMemoryError: bitmap size exceeds VM budget - Android
...n might help:
http://code.google.com/p/android/issues/detail?id=8488#c80
"Fast Tips:
1) NEVER call System.gc() yourself. This has been propagated as a fix here, and it doesn't work. Do not do it. If you noticed in my explanation, before getting an OutOfMemoryError, the JVM already runs a garbage c...
What is boxing and unboxing and what are the trade offs?
...m other types of values. On the other hand, working with them can be very fast and space efficient. Thus the trade off.
– Peter Burns
Nov 24 '10 at 19:22
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How to change href of tag on button click through javascript
...It then acts as an anchor instead of a link.
– Cobra_Fast
Dec 6 '10 at 10:35
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Thanks for reply y...
iOS 5 Best Practice (Release/retain?)
... and releases each object the instant it is no longer used, so apps run as fast as ever, with predictable, smooth performance.
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Inefficient jQuery usage warnings in PHPStorm IDE
...ng it to this makes PhpStorm happy and can evidently be more than twice as fast:
$("#property").find("[data-role='content'] .container");
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