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Approximate cost to access various caches and main memory?
...
325 ns - CPU cross-QPI/NUMA worst case on XEON E5-46*
10,000 ns - Compress 1K bytes with Zippy PROCESS
20,000 ns - Send 2K bytes over 1 Gbps NETWORK
250,000 ns - Read 1 MB sequentially from MEMORY
500,000 ns - Round trip within a same DataCenter
10,000,000...
Windbg Step 2 分析程序堆栈实战 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...点
2. lm查看loaded Modules
lm
start end module name
01330000 0134b000 MyApp C (private pdb symbols) E:\ProLab\WindbgFirst\Debug\MyApp.pdb
59bc0000 59ce4000 MSVCR90D (deferred)
75100000 75200000 kernel32 (deferred)
76750000 76796000 KERNE...
How to go about formatting 1200 to 1.2k in java
...g, String> suffixes = new TreeMap<> ();
static {
suffixes.put(1_000L, "k");
suffixes.put(1_000_000L, "M");
suffixes.put(1_000_000_000L, "G");
suffixes.put(1_000_000_000_000L, "T");
suffixes.put(1_000_000_000_000_000L, "P");
suffixes.put(1_000_000_000_000_000_000L, "E");
}
publi...
Are list-comprehensions and functional functions faster than “for loops”?
...rs):
return(sum([int(i)**2 for i in numbers]))
time_it(square_sum1, 100000, [1, 2, 5, 3, 1, 2, 5, 3])
time_it(square_sum2, 100000, [1, 2, 5, 3, 1, 2, 5, 3])
time_it(square_sum3, 100000, [1, 2, 5, 3, 1, 2, 5, 3])
time_it(square_sum4, 100000, [1, 2, 5, 3, 1, 2, 5, 3])
0:00:00.302000 #Reduce
0:...
Any reason not to use '+' to concatenate two strings?
...','E','F']
>>> myl2=[chr(random.randint(65,90)) for i in range(0,10000)]
Lets create two functions, UseJoin and UsePlus to use the respective join and + functionality.
>>> def UsePlus():
return [myl[i] + myl[i + 1] for i in range(0,len(myl), 2)]
>>> def UseJoin():
...
Is inject the same thing as reduce in ruby?
....size returns 4. Obviously 3 isn't an array, but beware of duck typing! (3_000_000_000_000_000.size returns 8 and 3_000_000_000_000_000_000_000_000_000_000_000_000_000_000.size returns 20; it seems to be the amount of memory it takes up.)
– ChrisPhoenix
Oct 15 ...
Replace all non Alpha Numeric characters, New Lines, and multiple White Space with one Space
...+/g
I loaded them up with a string length of random characters
length 5000
length 1000
length 200
Example javascript i used var newstr = str.replace(/[\W_]+/g," ");
Each run consisted of 50 or more sample on each regex, and i run them 5 times on each browser.
Lets race our horses!
Results
...
How do I create an average from a Ruby array?
... top solutions (in order of most efficient):
Large Array:
array = (1..10_000_000).to_a
Benchmark.bm do |bm|
bm.report { array.instance_eval { reduce(:+) / size.to_f } }
bm.report { array.sum.fdiv(array.size) }
bm.report { array.sum / array.size.to_f }
bm.report { array.reduce(:+).to_f / a...
How to track down a “double free or corruption” error
...box]$ ./t1
*** glibc detected *** ./t1: double free or corruption (top): 0x00000000058f7010 ***
======= Backtrace: =========
/lib64/libc.so.6[0x3a3127245f]
/lib64/libc.so.6(cfree+0x4b)[0x3a312728bb]
./t1[0x400500]
/lib64/libc.so.6(__libc_start_main+0xf4)[0x3a3121d994]
./t1[0x400429]
======= Memory m...
How to join strings in Elixir?
...ce seems roughly the same:
iex(22)> :timer.tc(fn -> Enum.each(1..10_000_000, fn _ -> "my name is " <> "adam" end) end)
{8023855, :ok}
iex(23)> :timer.tc(fn -> Enum.each(1..10_000_000, fn _ -> "my name is " <> "adam" end) end)
{8528052, :ok}
iex(24)> :timer.tc(fn -&g...