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What is the difference between user and kernel modes in operating systems?
... Salvador DaliSalvador Dali
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...
Why were pandas merges in python faster than data.table merges in R in 2012?
...ython package Pandas). Matching 1 million strings of which
of which 600,000 are unique is now reduced from 16s to 0.5s, for example.
also in that release was :
character columns are now allowed in keys and are preferred to
factor. data.table() and setkey() no longer coerce character to
fa...
What are transparent comparators?
...
60
What problem does this solve,
See Dietmar's answer and remyabel's answer.
and does thi...
How to create a new database after initally installing oracle database 11g Express Edition?
...
60
When you installed XE.... it automatically created a database called "XE". You can use your l...
Benchmarking (python vs. c++ using BLAS) and (numpy)
...dge CPUs:
Sandy (MKL, OpenBLAS, ATLAS):
CPU: 2 x 16 Intel(R) Xeon(R) E2560 Sandy Bridge @ 2.00GHz (16 Cores)
RAM: 64 GB
Ivy (MKL, OpenBLAS, ATLAS):
CPU: 2 x 20 Intel(R) Xeon(R) E2680 V2 Ivy Bridge @ 2.80GHz (20 Cores, with HT = 40 Cores)
RAM: 256 GB
Software
The software stack is for both ...
Benefits of header-only libraries
...
60
Benefits of header-only library:
Simplifies the build process. You don't need to build the li...
Image comparison - fast algorithm
... and it most likely to be very fast.
You can sub-sample an image to say 80x60 resolution or comparable,
and convert it to grey scale (after subsampling it will be faster).
Process both images you want to compare.
Then run normalised sum of squared differences between two images (the query image and ...
What is the difference between the kernel space and the user space?
..., %rsi
mov $hello_world_len, %rdx
syscall
/* exit */
mov $60, %rax
mov $0, %rdi
syscall
compile and run:
as -o hello_world.o hello_world.S
ld -o hello_world.out hello_world.o
./hello_world.out
GitHub upstream.
When this happens, the CPU calls an interrupt callback hand...
Check if a class is derived from a generic class
...
JaredParJaredPar
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4...
Approximate cost to access various caches and main memory?
... 22.5 ns )
remote L3 CACHE (Ref: Fig.1 [Pg. 5]) ~100-300 cycles ( 160.7 - 30.0 ns )
local DRAM ~60 ns
remote DRAM ~100 ns
EDIT2:
The most important is the notice under the cited table, sayi...