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pycharm running way slow
...ly proper way to fix your specific performance problem is by capturing the CPU profiler snapshot as described in this document and sending it to PyCharm support team, either by submitting a ticket or directly into the issue tracker.
After the CPU snapshot is analyzed, PyCharm team will work on a fi...
Length of string in bash
...ike to show the difference between string length and byte length:
myvar='Généralités'
chrlen=${#myvar}
oLang=$LANG oLcAll=$LC_ALL
LANG=C LC_ALL=C
bytlen=${#myvar}
LANG=$oLang LC_ALL=$oLcAll
printf "%s is %d char len, but %d bytes len.\n" "${myvar}" $chrlen $bytlen
will render:
Généralités ...
YYYY-MM-DD format date in shell script
... a more compact notation for the accepted answer.
– Håvard Geithus
Nov 16 '15 at 20:42
...
What's the best way to send a signal to all members of a process group?
...ll your own children, use pkill -TERM -P ${$}.
– François Beausoleil
Apr 10 '15 at 14:30
3
@Only...
Function pointers, Closures, and Lambda
...ct 16 '08 at 15:41
Jouni K. SeppänenJouni K. Seppänen
33.9k55 gold badges6767 silver badges9696 bronze badges
...
Thread context switch Vs. process context switch
...cision is made, kernel saves part of the thread context that is located in CPU (CPU registers) into the dedicated place in memory (frequently on the top of the kernel stack of outgoing thread). Then the kernel performs switch from kernel stack of outgoing thread on to kernel stack of the incoming th...
Timer function to provide time in nano seconds using C++
...fferent issues. For example in
Windows XP, all AMD Athlon X2 dual
core CPUs return the PC of either of
the cores "randomly" (the PC sometimes
jumps a bit backwards), unless you
specially install AMD dual core driver
package to fix the issue. We haven't
noticed any other dual+ core CPUs...
Why is processing a sorted array slower than an unsorted array?
...e accessed in memory-order. They have been allocated consecutively in RAM. CPUs love accessing memory sequentially because they can speculatively request the next cache line so it will always be present when needed.
When you are sorting the list you put it into random order because your sort keys a...
Redis 的性能幻想与残酷现实 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...作用。在实验环境的测试，单 Redis 实例运行稳定，单核 CPU 利用率在 70% ~ 80% 之间波动。除了测试 100 bytes 的包，还测了 1k、10k 和 100k 不同大小的包，如下图所示：
诚然，1k 基本是 Redis 性能的一个拐点，这一点从上图看趋势...
Optimal number of threads per core
Let's say I have a 4-core CPU, and I want to run some process in the minimum amount of time. The process is ideally parallelizable, so I can run chunks of it on an infinite number of threads and each thread takes the same amount of time.
...