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Abort makefile if variable not set
... :|check-defined-BAR
Notice that the check-defined-BAR is listed as the order-only (|...) prerequisite.
Pros:
(arguably) a more clean syntax
Cons:
One can't specify a custom error message
Running make -t (see Instead of Executing Recipes) will pollute your root directory with lots of check...
Android Studio - How to increase Allocated Heap Size
...the Help menu, just copy and paste the variables you might want to keep in order to increase it for everversion you might have on your box.
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foll...
The difference between sys.stdout.write and print?
... buffers the input and might not flush the input to the fd immediately. in order to make sure that it behaves like the print function, you should add: sys.stdout.flush()
– kerbelp
Nov 16 '17 at 7:27
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How to select only the records with the highest date in LINQ
...q = from n in table
group n by n.AccountId into g
select g.OrderByDescending(t=>t.Date).FirstOrDefault();
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How to move a model between two Django apps (Django 1.7)
..., from an SQL point of view you can apply the trick of this answer. But in order to achieve this only via Django, one approach I can think of would be along the lines of @ozan answer, except the first step would be to duplicate the tables involved in MTM relationship (one version of the dupes in eac...
Find and copy files
...intent is to copy the found files into /home/shantanu/tosend, you have the order of the arguments to cp reversed:
find /home/shantanu/processed/ -name '*2011*.xml' -exec cp "{}" /home/shantanu/tosend \;
Please, note: the find command use {} as placeholder for matched file.
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How to find the Windows version from the PowerShell command line
...y all of them. In that respect I think BuildLabEx, Kernel and HAL (in that order) would be the most appropriate way to give a more proper version. But since you seem to know what is wrong, you should post what is right.
– not2qubit
Dec 11 '18 at 8:42
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How to reset postgres' primary key sequence when it falls out of sync?
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@Valery: But in order to avoid gaps mentioned by @mikl two comments above, you need SELECT setval('your_table_id_seq', coalesce((select max(id)+1 from your_table), 1), false);
– Antony Hatchkins
Nov 9 '...
Context switches much slower in new linux kernels
...able
plain old Unix signals
I had to add
#include <stdint.h>
in order to compile, which I did with this command
g++ -O3 -o condvar-perf condvar-perf.cpp -lpthread -lrt
On kernel 2.6.32
$ ./condvar-perf 1000000
NPTL
mutex elapsed: 29085 us; per iteration: 29 ns / 9...
Task not serializable: java.io.NotSerializableException when calling function outside closure only o
...also has the benefit of not requiring the additional Shark dependencies in order to access KryoSerializationWrapper, since Twitter's Chill is already pulled in by core Spark
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