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Grepping a huge file (80GB) any way to speed it up?
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If you have a multicore CPU, I would really recommend GNU parallel. To grep a big file in parallel use:
< eightygigsfile.sql parallel --pipe grep -i -C 5 'db_pd.Clients'
Depending on your disks and CPUs it may be faster to read larger blocks:
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How do I detect if software keyboard is visible on Android Device or not?
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Yeah, it always return true.
– Léon Pelletier
Mar 25 '14 at 20:45
187
It is...
What are bitwise operators?
...ut bit on the bottom line. So the answer to the above expression is 4. The CPU has done (in this example) 8 separate "AND" operations in parallel, one for each column.
I mention this because I still remember having this "AHA!" moment when I learned about this many years ago.
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Fast way of finding lines in one file that are not in another?
...iently large that storing them both causes a memory problem, you can trade CPU for memory by storing only file1 and deleting matches along the way as file2 is read.
BEGIN { FS="" }
(NR==FNR) { # file1, index by lineno and string
ll1[FNR]=$0; ss1[$0]=FNR; nl1=FNR;
}
(NR!=FNR) { # file2
if ($0 ...
How do I create a unique constraint that also allows nulls?
...onal disk space.
Note that if you don't want an index, you can still save CPU by making the expression be precalculated to disk by adding the keyword PERSISTED to the end of the column expression definition.
In SQL Server 2008 and up, definitely use the filtered solution instead if you possibly ca...
Should I instantiate instance variables on declaration or in the constructor?
...ow it was him). Personal taste is personal taste; ultimately, neither the CPU nor the JRE care about syntactical style.
– Aquarelle
Sep 20 '13 at 22:38
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Dealing with “java.lang.OutOfMemoryError: PermGen space” error
...ust too many classes/static data in your web app.
– Péter Török
Dec 14 '11 at 8:50
got the same issue as HDave when...
How to pass command line arguments to a shell alias? [duplicate]
... blah(){ echo "First: $1"; echo "Second: $2"; }
– René Nyffenegger
Apr 24 '16 at 13:38
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python-pandas and databases like mysql
...e: dialect+driver://user:pwd@host:port/db
– Nuno André
Sep 15 '19 at 20:03
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Is it possible to program iPhone in C++
...r. But once I really "got" it, it was very very exciting.
It sounds cliché, but it's true. Stick it out.
Of course, if you're bringing in C++ libraries or existing C++ code, you can use those modules with Objective-C/Objective-C++.
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