大约有 4,700 项符合查询结果（耗时：0.0282秒） [XML]
A weighted version of random.choice
...m a list of 8 weighted items 10,000 times, numpy.random.choice took 0.3286 sec where as random.choices took 0.0416 sec, about 8x faster.
– Anton Codes
Jun 18 '19 at 13:34
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How can I restore the MySQL root user’s full privileges?
...WHERE User='root'; FLUSH PRIVILEGES; I got Query ok, 0 rows affected(0.00 sec) rows matched:2 changed:0 warnings:0 Query ok, 0 rows affected(0.00 sec). When I logged in to phpMyAdmin as root user, I still see "No privileges".
– Steven
Nov 10 '09 at 16:22
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Best way to do multi-row insert in Oracle?
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Around 10-12 Multiple INSERT statements get completed in 2secs on my PC, while the above syntax is able to INSERT 1000 records per sec! Impressed! Note that I COMMIT only at the end.
– Kent Pawar
Apr 22 '14 at 21:30
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What does the number in parentheses shown after Unix command names in manpages mean?
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It's the section that the man page for the command is assigned to.
These are split as
General commands
System calls
C library functions
Special files (usually devices, those found in /dev) and drivers
File formats and conventions
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Tuning nginx worker_process to obtain 100k hits per min
... I think the equation provided for total amount of users per sec is wrong. Instead the average amount of users served per second should be = worker_processes * worker_connections / (keepalive_timeout * 2) Therefore, the above conf file can server ~7.6K connections per sec, which is way...
Fastest way to check a string contain another substring in JavaScript?
...s of 1600% faster). It's unclear how a difference of 44 million iterations/sec and 777+ million i/sec affects real-world performance, however mobile likely benefits enough that indexOf should be the ideal choice.
– Chad Levy
Sep 13 '18 at 20:06
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How to check if a file is a valid image file?
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With this code you are going to verify a set of images at about 10 MBytes/sec with standard Pillow or 40 MBytes/sec with Pillow-SIMD module (modern 2.5Ghz x86_64 CPU).
For the other formats psd,xcf,.. you can use Imagemagick wrapper Wand, the code is as follows:
im = wand.image.Image(filename=fil...
SQL Server: Database stuck in “Restoring” state
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I had a similar incident with stopping a log shipping secondary server.
After the command to remove the server from log shipping and stopped the log shipping from primary server the database on secondary server got stuck in restoring status after the command
RESTORE DATABASE &l...
Check if all elements in a list are identical
...---------|--------------|---------------|----------------|
| s1 | 1.19 msec | 348 usec | 183 usec | 51.6 usec | 121 usec |
| s2 | 1.17 msec | 376 usec | 185 usec | 50.9 usec | 118 usec |
| s3 | 4.17 usec | 348 usec | 120 usec | 264 usec | 61.3 ...
Approximate cost to access various caches and main memory?
Can anyone give me the approximate time (in nanoseconds) to access L1, L2 and L3 caches, as well as main memory on Intel i7 processors?
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