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How to read a large file - line by line?
...htop to see that with plain old sequential pandas dataframe.read_csv, 100% cpu on just one core is the actual bottleneck in pd.read_csv, not the disk at all.
I should add I'm using an SSD on fast video card bus, not a spinning HD on SATA6 bus, plus 16 CPU cores.
Also, another technique that I disc...
Why doesn't C++ have a garbage collector?
... responsiveness or server loading?
should it use lots of memory or lots of CPU?
C/c++ is used in just too many different circumstances.
I suspect something like boost smart pointers will be enough for most users
Edit - Automatic garbage collectors aren't so much a problem of performance (you can a...
How to lock compiled Java classes to prevent decompilation?
...e not read the post I linked to. The bytecode is converted to the dongle's CPU code and encrypted. When the end user runs the protected app, that encrypted code is transferred to the "dongle". The dongle decrypts and runs it on its CPU.
– Dmitry Leskov
Aug 10 '...
Peak memory usage of a linux/unix process
...ime (seconds): 0.00
System time (seconds): 0.01
Percent of CPU this job got: 250%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0:00.00
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Av...
How to detect the OS from a Bash script?
...
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...
Using GZIP compression with Spring Boot/MVC/JavaConfig with RESTful
...t/html,text/xml,text/plain,application/javascript,text/css
# not worth the CPU cycles at some point, probably
server.compression.min-response-size=10240
In application.properties 1.2.2 - <1.3
server.tomcat.compression=on
server.tomcat.compressableMimeTypes=application/json,application/xml,tex...
Linux 进程卡住了怎么办？ - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...rocess在我们使用 Linux 系统时，如果网络或者磁盘等 I O 出问题，会发现进程卡住了，即使用 kill -9 也无法杀掉进程，很多常用的调试工具，比如 strace, pstack 等也都失灵了
在我们使用 Linux 系统时，如果网络或者磁盘等 I/O 出...
How to measure elapsed time in Python?
...robably enough in most cases. On Unix, you can use time.clock() to measure CPU time.
– KGS
Jul 6 '17 at 10:00
1
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Is there an auto increment in sqlite?
...old & italic are mine):
The AUTOINCREMENT keyword imposes extra CPU, memory, disk space, and
disk I/O overhead and should be avoided if not strictly needed. It is
usually not needed.
In SQLite, a column with type INTEGER PRIMARY KEY is an alias for the
ROWID (except in WITHOUT ROW...
Wait 5 seconds before executing next line
...
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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