大约有 1,359 项符合查询结果（耗时：0.0266秒） [XML]
Create an index on a huge MySQL production table without table locking
...
kennytm
451k9292 gold badges980980 silver badges958958 bronze badges
answered Jan 10 '13 at 0:28
Dave DopsonDave Dopson
...
Context switches much slower in new linux kernels
..., 0x601ac0, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1
0.000125 futex(0x7f98ce4c0b88, FUTEX_WAKE_PRIVATE, 2147483647) = 0
0.000042 futex(0x601b00, FUTEX_WAKE_PRIVATE, 1) = 1
0.000038 futex(0x601b00, FUTEX_WAKE_PRIVATE, 1) = 1
0.000037 futex(0x601b00, FUTEX_WAKE_PRIVATE, 1) = 1
0.000030 futex(0x...
Python str vs unicode types
...(0xE2 0x89 0xA0)
???? → 11110000 10011111 10011000 10000010 (0xF0 0x9F 0x98 0x82)
The way UTF-8 encodes characters to bit strings is very well described here.
Unicode and Encodings
Looking at the above examples, it becomes clear how Unicode is useful.
For example, if I'm Latin-1 and I want to...
How to add texture to fill colors in ggplot2
...a$Points6 <- c(49, 56, 63, 71, 78)
Example.Data$Points7 <- c(84, 91, 98, 6, 12)
Finally I added geom_jitters to the ggplot above using the new columns for positioning and re-using 'Points' to vary the size of the 'bubbles':
+geom_jitter(data=Example.Data,aes(x=Bubbles, y=Points, size=Points...
Why do we need private subnet in VPC?
... data transfer charges for all data transferred via the NAT gateway) = $47.98
t2.nano instance configured as a NAT instance = $4.84/month ($0.0065 * 744 hours in a month) + $10 ($.10/GB standard AWS data transfer charges for all data transferred via the NAT instance) = $14.84
This of course change...
Why would you use an ivar?
...un", (cft * 10000000000.0) / kRuns);
Output:
1: 23.0 picoseconds/run
2: 98.4 picoseconds/run
This is 4.28 times slower and this was a non-atomic primitive int, pretty much the best case; most other cases are even worse (try an atomic NSString * property!). So if you can live with the fact that ...
Sorting 1 million 8-decimal-digit numbers with 1 MB of RAM
...mbers, compressed size: 13683 compression factor: 0.34
bucket[1] contains: 9885 numbers, compressed size: 13479 compression factor: 0.34
...
bucket[98] contains: 10026 numbers, compressed size: 13612 compression factor: 0.34
bucket[99] contains: 10058 numbers, compressed size: 13701 compression fact...
Why does the C preprocessor interpret the word “linux” as the constant “1”?
...rammers would simply avoid using those names for their own purposes.
The 1989 ANSI C standard introduced rules restricting what symbols an implementation could legally predefine. A macro predefined by the compiler could only have a name starting with two underscores, or with an underscore followed ...
Verifying signed git commits?
...e commit e18443e, commit aeff29d, commit ca194d5, commit 434060e, commit 8e98e5f, commit a4cc18f, commit d66aeff (21 Jun 2015) by brian m. carlson (bk2204).
(Merged by Junio C Hamano -- gitster -- in commit ba12cb2, 03 Aug 2015)
verify-tag/verify-commit: add option to print raw gpg status info...
Why does struct alignment depend on whether a field type is primitive or user-defined?
... 4-byte integers and put &test in the Address field:
0x000000E928B5DE98 0ed750e0 000000e9 11111111 00000000 22222222 00000000
0xe90ed750e0 is the string pointer on my machine (not yours). You can easily see the Int32Wrappers, with the extra 4 bytes of padding that turned the size into 24 ...