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How to detect the OS from a Bash script?
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Detecting operating system and CPU type is not so easy to do portably. I have a sh script of about 100 lines that works across a very wide variety of Unix platforms: any system I have used since 1988.
The key elements are
uname -p is processor type but...
Which is faster in Python: x**.5 or math.sqrt(x)?
... Took 0.157436 seconds Took 0.093905 seconds Target system: Ubuntu Linux CPU: Intel(R) Core(TM)2 Duo CPU T9600 @ 2.80GHz As you can see I got different results. According to this your answer is not generic.
– zoli2k
Apr 23 '10 at 3:37
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_csv.Error: field larger than field limit (131072)
...ue is a C long ([Wikipedia]: C data types), whose size varies depending on CPU architecture and OS (ILP). The classical difference: for a 64bit OS (Python build), the long type size (in bits) is:
Nix: 64
Win: 32
When attempting to set it, the new value is checked to be in the long boundaries, th...
JavaScript, Node.js: is Array.forEach asynchronous?
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technically, forEach isn't "blocking", as the CPU never goes to sleep. It's synchronous and CPU-bound, which can feel like "blocking" when you expect the node app to be responsive to events.
– Dave Dopson
Aug 2 '11 at 17:58
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Wait 5 seconds before executing next line
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So basically you are wasting CPU time. That's not a wait as you are not putting the thread into sleep mode allowing the main processor to focus in other tasks.
– Kyordhel
Jul 6 '17 at 20:25
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Convert from enum ordinal to enum type
...nst char CLUBS=0;' etc... Yes,a HashMap lookup is O(1), but the memory and CPU overhead of a HashMap, in this case make it many orders of magnitude slower and resource hungry than calling .values() directly! No wonder Java is such a memory hog if people write like this...
– Les...
What is the behavior of integer division?
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Truncation is how most common CPU hardware (e.g. x86) behaves, so it would be crazy to make a different choice. IDK which came first, Fortran semantics or hardware behaviour, but it's not a coincidence that those are the same, too.
–...
Where are my postgres *.conf files?
... an arbitrary scale
#random_page_cost = 4.0 # same scale as above
#cpu_tuple_cost = 0.01 # same scale as above
#cpu_index_tuple_cost = 0.005 # same scale as above
#cpu_operator_cost = 0.0025 # same scale as above
#effective_cache_size = 128MB
# - Genetic Query Optimizer -...
Attempted to read or write protected memory. This is often an indication that other memory is corrup
...out, the problem was that I changed the Platform for Build from x86 to Any CPU and that was enough to trigger this error. Changing it back to x86 did the trick. Might help someone.
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...监控日志，一方面帮助日志微调，一方面及早发现程序的问题
只做到第1点的，你可以洗洗去睡了。很多公司都有做到第2点和第3点，这些公司的服务端程序基本已经跑了很长时间了，已比较稳定，确实无需花太多时间去关注...