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how to avoid to use memcpy to create a string


By : NewInNewHamp
Date : August 01 2020, 03:00 PM
should help you out Use an std::string_view to avoid copying the string.
code :
#include <string_view>
// ...

const string_view strview(p, 4);


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avoid trap representation with memcpy


By : user3897568
Date : March 29 2020, 07:55 AM
it helps some times Please consider the following code: , The sanctioned way which won't produce any trap representation is
code :
unsigned char obj[sizeof float];
memcpy(obj, &float_value, sizeof float);

spsc_queue pop - avoid memcpy?


By : jeson
Date : March 29 2020, 07:55 AM
hop of those help? You can't.
This is exactly required so the SPSC queue can be implemented in a lockfree fashion (assuming fixed capacity).

How to avoid memcpy if number of blocks depends on device variable?


By : YG 项
Date : March 29 2020, 07:55 AM
Hope this helps I am computing a number, X, on the device. Now I need to launch a kernel with X threads. I can set the blockSize to 1024. Is there a way to set the number of blocks to ceil(X / 1024) without performing a memcpy? , I see two possibilities:

Why gcc duplicates rodata string for memcpy? How to avoid it?


By : Manoz Kumar
Date : March 29 2020, 07:55 AM
this will help The behavior you observe is specified explicitly by the standard. In
code :
static const char pattern[] = "[SOME TEST PATTERN TO CALCULATE SUM FROM] ";
static const char * const pattern = "[SOME TEST PATTERN TO CALCULATE SUM FROM] ";
static const char pattern[] = {
        '[', 'S', 'O', 'M', 'E', ' ', 'T', 'E', 'S', 'T', ' ', 'P', 'A', 'T',
        'T', 'E', 'R', 'N', ' ', 'T', 'O', ' ', 'C', 'A', 'L', 'C', 'U', 'L',
        'A', 'T', 'E', ' ', 'S', 'U', 'M', ' ', 'F', 'R', 'O', 'M', ']', ' ', '\0' };

How avoid memcpy with flip and transpose in arrayfire?


By : Kushal Parikh
Date : March 29 2020, 07:55 AM
may help you . ArrayFire uses a memory manager to avoid unnecessary allocation and deallocations. This is required because all allocations trigger an implicit device synchronize on all queues on certain platforms. This can get very costly so ArrayFire will track af::arrays which go out of bounds and reuse them if necessary. ArrayFire also allocates memory at startup.
In your case you are allocating ~600MB at the randu call(c64 is a complex double so each element is 16 bytes). There is another 600MB allocation for the flip operation which is stored in b. Transpose will allocate 600MB but will reserve the older values for reuse. At this point you have about 1800 MB of memory allocated because of these operations.
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