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dd: How to calculate optimal blocksize? [closed]
...K 512K 1M 2M 4M 8M 16M 32M 64M
for BLOCK_SIZE in 512 1024 2048 4096 8192 16384 32768 65536 131072 262144 524288 1048576 2097152 4194304 8388608 16777216 33554432 67108864
do
# Calculate number of segments required to copy
COUNT=$(($TEST_FILE_SIZE / $BLOCK_SIZE))
if [ $COUNT -le 0 ]; then
...
What is Java String interning?
...tem.out:Ljava/io/PrintStream;
33: aload_1
34: aload_3
35: if_acmpne 42
38: iconst_1
39: goto 43
42: iconst_0
43: invokevirtual #7 // Method java/io/PrintStream.println:(Z)V
Note how:
0 and 3: the same ldc #2 constant is loaded (the literals)
12: a new string instance is cre...
What is the difference between a weak reference and an unowned reference?
... Viktor Kucera
5,42011 gold badge2929 silver badges3838 bronze badges
answered Oct 21 '14 at 17:47
MyxticMyxtic
5,38955 gold badg...
How to see which commits in one branch aren't in the other?
...f24bfc70e674c627949
+ b4459544c000f4d51d1ec23f279d9cdb19c1d32b
+ b6ce3b78e938644a293b2dd2a15b2fecb1b54cd9
The commits that begin with + will be the ones that you haven't yet cherry-picked into next. In this case, I'd only cherry-picked one commit so far. You might want to add the -v parameter to...
Why is SELECT * considered harmful?
...
– Michał Tatarynowicz
Sep 4 '10 at 6:38
1
...
What happens to a declared, uninitialized variable in C? Does it have a value?
...
answered Oct 20 '09 at 21:38
DigitalRossDigitalRoss
132k2323 gold badges226226 silver badges307307 bronze badges
...
What is the global interpreter lock (GIL) in CPython?
...
38
Let's first understand what the python GIL provides:
Any operation/instruction is executed in ...
MIT vs GPL license [closed]
...ned work.
– Mark H
Apr 10 '11 at 13:38
...
Why is unsigned integer overflow defined behavior but signed integer overflow isn't?
...ppropriately.
– caf
Aug 13 '13 at 1:38
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show 15 more comments
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Insert, on duplicate update in PostgreSQL?
... example of doing what you possibly want to do, in the manual:
Example 38-2. Exceptions with UPDATE/INSERT
This example uses exception handling to perform either UPDATE or INSERT, as appropriate:
CREATE TABLE db (a INT PRIMARY KEY, b TEXT);
CREATE FUNCTION merge_db(key INT, data TEXT) RE...