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Go > operators
...ed to be) the same. The reason for this is that emitting exactly 1 SHL/SHR/etc instruction to implement the shift operator is the best thing that an optimizing C/C++ compiler can do when the context does not tell it anything about 'x' and 'y'. And, if the compiler knows for a fact that the code has ...
Why is it not advisable to have the database and web server on the same machine?
...xtra cost, dedicated network connection between the two, more maintenance, etc.), especially for a small application, where neither piece is using too much CPU or memory? Even with two servers, with one server compromised, an attacker could still do serious damage, either by deleting the database, ...
一次「Too many open files」故障 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...务不可用故障，于是我惯性的判断应该还是 ES_HEAP_SIZE 的问题，不过登录服务器后发现日志里显示大量的「Too many open files」错误信息。
那么 ElasticSearch 设置的最大文件数到底是多少呢？可以通过 proc 确认：
shell> cat /proc/<PID>/l...
How to see top processes sorted by actual memory usage?
...f the slab allocators have allocated how much, what their ratios are like, etc.
– sarnold
Jul 7 '16 at 0:29
Thanks for...
Beyond Stack Sampling: C++ Profilers
..., it handles all kinds of sampling profiler output (AQtime, Sleepy, XPerf, etc). Once the visualization has pointed out the offending function(s), jump back to the raw profile data to get better hints on what the real cause is.
The gprof2dot tool generates a dot graph description that you then feed...
How do I measure separate CPU core usage for a process?
Is there any way to measure a specific process CPU usage by cores?
8 Answers
8
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Why is volatile not considered useful in multithreaded C or C++ programming?
...ake concurrent access to
data safe (spinlocks, mutexes, memory barriers, etc.) are designed to
prevent unwanted optimization. If they are being used properly, there
will be no need to use volatile as well. If volatile is still
necessary, there is almost certainly a bug in the code somewher...
VS2013 permanent CPU usage even though in idle mode
I've recently updated VS2013 to Update 1 and since then VS takes CPU usage to 25% (on a 4 cores intel i5 cpu) permanently even though it's supposed to be idle. I thought it has some unfinished background processes so I left it running for a while but it keeps using the cpu when it's supposed to be i...
How to run a program without an operating system?
...;
};
}
entry.S
.code16
.text
.global mystart
mystart:
ljmp $0, $.setcs
.setcs:
xor %ax, %ax
mov %ax, %ds
mov %ax, %es
mov %ax, %ss
mov $__stack_top, %esp
cld
call main
linker.ld
ENTRY(mystart)
SECTIONS
{
. = 0x7c00;
.text : {
entry.o(.text)
*(.text)
...
FTP/SFTP access to an Amazon S3 Bucket [closed]
...our security credentials in a form access-key-id:secret-access-key to /etc/passwd-s3fs
Add a bucket mounting entry to fstab:
<bucket> /mnt/<bucket> fuse.s3fs rw,nosuid,nodev,allow_other 0 0
For details, see my guide Setting up an SFTP access to Amazon S3.
Use S3 Client
Or use any...