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Benchmarking (python vs. c++ using BLAS) and (numpy)
...w. However for the new machines I also ran the benchmark for matrix sizes 5000 and 8000.
The table below includes the benchmark results from the original answer (renamed: MKL --> Nehalem MKL, Netlib Blas --> Nehalem Netlib BLAS, etc)
Single threaded performance:
Multi threaded performance...
IPC performance: Named Pipe vs Socket
...ubuntu 4.4.0 x86_64 i7-6700K 4.00GHz)
Message: 128 bytes
Messages count: 1000000
Pipe benchmark:
Message size: 128
Message count: 1000000
Total duration: 27367.454 ms
Average duration: 27.319 us
Minimum duration: 5.888 us
Maximum duration: 15763.712 us
Standard deviation: 26...
Convert PDF to image with high resolution
...pdfimages fileName.pdf fileName # save in .ppm format
$ convert fileName-000.ppm fileName-000.png
this generate the best and smallest result file.
Note: For lossy JPG embedded images, you had to use -j:
$ pdfimages -j fileName.pdf fileName # save in .jpg format
With recent poppler you can ...
Select random row from a sqlite table
... .timer on
sqlite> select count(*) from payment;
16049
Run Time: real 0.000 user 0.000140 sys 0.000117
sqlite> select payment_id from payment limit 1 offset abs(random()) % (select count(*) from payment);
14746
Run Time: real 0.002 user 0.000899 sys 0.000132
sqlite> select payment_id from ...
Deleting lines from one file which are in another file
...
This worked for me, as my files were sorted and had 250,000+ lines in one of them, only 28,000 in the other. Thanks!
– Winter
May 26 '14 at 22:22
1
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Python and pip, list all versions of a package that's available?
... answered Mar 24 '11 at 16:11
m000m000
4,90633 gold badges2626 silver badges2828 bronze badges
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Why is ArrayDeque better than LinkedList
... Measure time in terms of milliseconds.
Test Result:
Below 10,000 elements, both LinkedList and ArrayDeque tests averaged at a sub 1 ms level.
As the sets of data get larger, the differences between the ArrayDeque and LinkedList average test time gets larger.
At the test size ...
Best database field type for a URL
...Firefox 1.5.x. However, longer URLs will work. I stopped testing after 100,000 characters."
– Wesley Murch
May 17 '12 at 21:56
1
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Safest way to convert float to integer in python?
...e stored accurately.
Adding one to 111(omitted)111 (53 ones) yields 100...000, (53 zeroes). As we know, we can store 53 digits, that makes the rightmost zero padding.
This is where 253 comes from.
More detail: We need to consider how IEEE-754 floating point works.
1 bit 11 / 8 52 / 23...
What is the difference between partitioning and bucketing a table in Hive ?
...s, your file structure will look something like below.
server_date=xyz
00000_0
00001_0
00002_0
........
00010_0
Here server_date=xyz is the partition and 000 files are the buckets in each partition. Buckets are calculated based on some hash functions, so rows with name=Sandy will always go in...