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What is a “memory stomp”?
...at conflicts. There are several common ways memory can be stomped.
One is allocating, say, 100 bytes of memory but then storing something past the 100th address. This memory might be used to hold something completely different. This is particularly hard to debug because the problem will appear when...
Can't specify the 'async' modifier on the 'Main' method of a console app
...f my async console apps:
static void Main(string[] args)
{
CancellationTokenSource cts = new CancellationTokenSource();
System.Console.CancelKeyPress += (s, e) =>
{
e.Cancel = true;
cts.Cancel();
};
MainAsync(args, cts.Token).GetAwaiter.GetResult();
}
st...
Where are environment variables stored in registry?
... PATH /t REG_SZ /f /d "%PATH%"
::@REG QUERY %l_regpath% /v %1 /S
@FOR /F "tokens=*" %%A IN ('REG QUERY %l_regpath% /v %1 /S') DO (
@ set l_a=%%A
@ if NOT "!l_a!"=="!l_a: =!" set l_line=!l_a!
)
::delimiter is four spaces change it to tab \t
@set l_line=!l_line!
@set l_line=%l_line: = %
...
What Every Programmer Should Know About Memory?
...gepages work well on Linux without having to manually use hugetlbfs. Make allocations >= 2MiB with 2MiB alignment (e.g. posix_memalign, or an aligned_alloc that doesn't enforce the stupid ISO C++17 requirement to fail when size % alignment != 0).
A 2MiB-aligned anonymous allocation will use hug...
Most efficient way to concatenate strings?
...e expected semantics of a 'string join' operation).
Next, given the total allocation size of the final string, the biggest boost in performance is gained by building the result string in-place. Doing this requires the (perhaps controversial) technique of temporarily suspending the immutability of a...
Removing trailing newline character from fgets() input
... helpful answer. Can we use strlen(buffer) when buffer size is dynamically allocated using malloc ?
– rrz0
Nov 10 '18 at 10:16
...
C pointer to array/array of pointers disambiguation
...
So, for 32 bit systems: int* arr[8]; /* 8x4 bytes allocated, for each pointer / int (*arr)[8]; / 4 bytes allocated, only a pointer */
– George
May 13 '09 at 18:43
...
How to append rows to an R data frame
...
Not knowing what you are trying to do, I'll share one more suggestion: Preallocate vectors of the type you want for each column, insert values into those vectors, and then, at the end, create your data.frame.
Continuing with Julian's f3 (a preallocated data.frame) as the fastest option so far, def...
Meaning of acronym SSO in the context of std::string
...es ("from the stack", which are variables that you create without calling malloc / new) are generally much faster than those involving the free store ("the heap", which are variables that are created using new). However, the size of automatic arrays is fixed at compile time, but the size of arrays f...
Should I compile with /MD or /MT?
... of the CRT - which means they will all share a single CRT heap and memory allocated in one .exe/.dll can be freed in another.
If you use the static CRT for your .exe and all .dlls then they'll all get a seperate copy of the CRT - which means they'll all use their own CRT heap so memory must be fre...