On 12/01/2018 18:52, Lee wrote:
On 1/12/18, Marco Atzeri wrote:
On 12/01/2018 08:19, Lee wrote:
I have roughly the same for both 32 and 64 cygwin version on W7-64
which flavor of gcc - the cygwin version that builds an executable
that pulls in the posix emulation layer or the mingw version
On 1/12/18, cyg Simple wrote:
> On 1/12/2018 3:41 PM, Corinna Vinschen wrote:
>> On Jan 12 14:59, cyg Simple wrote:
>>> On 1/12/2018 9:33 AM, Corinna Vinschen wrote:
On Jan 12 15:06, Christian Franke wrote:
> Timing [cm]alloc() calls without actually using the allocated memory
> might
On 1/12/18, Corinna Vinschen wrote:
> On Jan 12 15:06, Christian Franke wrote:
>> Lee wrote:
>> > Why is the cygwin gcc calloc so much slower than the
>> > i686-w64-mingw32-gcc calloc?
>> >1:12 vs 0:11
<.. snip example prog ..>
>>
>> Could reproduce the difference on an older i7-2600K mach
On 1/12/18, Christian Franke wrote:
> Lee wrote:
>> Why is the cygwin gcc calloc so much slower than the
>> i686-w64-mingw32-gcc calloc?
>>1:12 vs 0:11
>>
>> $cat calloc-test.c
>> #include
>> #include
>> #define ALLOCATION_SIZE (100 * 1024 * 1024)
>> int main (int argc, char *argv[]) {
>>
On 1/12/2018 3:41 PM, Corinna Vinschen wrote:
> On Jan 12 14:59, cyg Simple wrote:
>> On 1/12/2018 9:33 AM, Corinna Vinschen wrote:
>>> On Jan 12 15:06, Christian Franke wrote:
Timing [cm]alloc() calls without actually using the allocated memory might
produce misleading results due to laz
On 1/12/2018 9:06 AM, Christian Franke wrote:
This variant of the above code adds one write access to each 4KiB page (guarded by "volatile" to
prevent dead assignment optimization):
#include
#include
#define ALLOCATION_SIZE (100 * 1024 * 1024)
int main (int argc, char *argv[]) {
for (in
On Jan 12 14:59, cyg Simple wrote:
> On 1/12/2018 9:33 AM, Corinna Vinschen wrote:
> > On Jan 12 15:06, Christian Franke wrote:
> >> Timing [cm]alloc() calls without actually using the allocated memory might
> >> produce misleading results due to lazy page allocation and/or zero-filling.
> >>
> >>
On 1/12/2018 2:59 PM, cyg Simple wrote:
> On 1/12/2018 9:33 AM, Corinna Vinschen wrote:
>> On Jan 12 15:06, Christian Franke wrote:
>>> Lee wrote:
Why is the cygwin gcc calloc so much slower than the
i686-w64-mingw32-gcc calloc?
1:12 vs 0:11
$cat calloc-test.c
#incl
On 1/12/2018 9:33 AM, Corinna Vinschen wrote:
> On Jan 12 15:06, Christian Franke wrote:
>> Lee wrote:
>>> Why is the cygwin gcc calloc so much slower than the
>>> i686-w64-mingw32-gcc calloc?
>>>1:12 vs 0:11
>>>
>>> $cat calloc-test.c
>>> #include
>>> #include
>>> #define ALLOCATION_SIZE (10
On Jan 12 15:06, Christian Franke wrote:
> Lee wrote:
> > Why is the cygwin gcc calloc so much slower than the
> > i686-w64-mingw32-gcc calloc?
> >1:12 vs 0:11
> >
> > $cat calloc-test.c
> > #include
> > #include
> > #define ALLOCATION_SIZE (100 * 1024 * 1024)
> > int main (int argc, char *a
Lee wrote:
Why is the cygwin gcc calloc so much slower than the
i686-w64-mingw32-gcc calloc?
1:12 vs 0:11
$cat calloc-test.c
#include
#include
#define ALLOCATION_SIZE (100 * 1024 * 1024)
int main (int argc, char *argv[]) {
for (int i = 0; i < 1; i++) {
void *temp = calloc(
On 1/12/18, Marco Atzeri wrote:
> On 12/01/2018 08:19, Lee wrote:
>> Why is the cygwin gcc calloc so much slower than the
>> i686-w64-mingw32-gcc calloc?
>>1:12 vs 0:11
>>
>> $cat calloc-test.c
>> #include
>> #include
>> #define ALLOCATION_SIZE (100 * 1024 * 1024)
>> int main (int argc, char
On 12/01/2018 08:19, Lee wrote:
Why is the cygwin gcc calloc so much slower than the
i686-w64-mingw32-gcc calloc?
1:12 vs 0:11
$cat calloc-test.c
#include
#include
#define ALLOCATION_SIZE (100 * 1024 * 1024)
int main (int argc, char *argv[]) {
for (int i = 0; i < 1; i++) {
On 1/12/2018 2:19 AM, Lee wrote:
Why is the cygwin gcc calloc so much slower than the
i686-w64-mingw32-gcc calloc?
Since your test repeatedly allocates and frees one chunk
of size 100 Mb (ouch!) my guess is that the slow behavior is
rooted in something to do with mmap. Perhaps Corinna
or anoth
Why is the cygwin gcc calloc so much slower than the
i686-w64-mingw32-gcc calloc?
1:12 vs 0:11
$cat calloc-test.c
#include
#include
#define ALLOCATION_SIZE (100 * 1024 * 1024)
int main (int argc, char *argv[]) {
for (int i = 0; i < 1; i++) {
void *temp = calloc(ALLOCATION_SIZE,
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