Displaying 3 results from an estimated 3 matches for "convert_co_do_copy".
2017 Nov 15
3
Effect of qemu-img convert -m and -W options
[CC to qemu-devel since I'm obviously doing something wrong here,
I'm just not sure what.]
I was getting ready to add multiple threads to ‘qemu-img convert’ (the
longest part of v2v conversions) when I noticed that it had them
already! (To be fair this was only added in February this year so no
wonder we didn't notice.)
To enable parallel convert we would need to use the ‘qemu-img
2017 Nov 16
0
Re: [Qemu-devel] Effect of qemu-img convert -m and -W options
...reads
and writes is not multi-threaded but a number of coroutines executing in
a single thread.
The qemu-img convert logic runs in coroutines from just one main loop
thread in qemu-img.c:convert_do_copy():
for (i = 0; i < s->num_coroutines; i++) {
s->co[i] = qemu_coroutine_create(convert_co_do_copy, s);
s->wait_sector_num[i] = -1;
qemu_coroutine_enter(s->co[i]);
}
while (s->running_coroutines) {
main_loop_wait(false);
}
>
> I did some testing to see what effect this has. For this I used a
> large guest image which is approximately a third full of...
2017 Nov 16
2
Re: [Qemu-devel] Effect of qemu-img convert -m and -W options
...ded but a number of coroutines executing in
> a single thread.
>
> The qemu-img convert logic runs in coroutines from just one main loop
> thread in qemu-img.c:convert_do_copy():
>
> for (i = 0; i < s->num_coroutines; i++) {
> s->co[i] = qemu_coroutine_create(convert_co_do_copy, s);
> s->wait_sector_num[i] = -1;
> qemu_coroutine_enter(s->co[i]);
> }
>
> while (s->running_coroutines) {
> main_loop_wait(false);
> }
>
>> I did some testing to see what effect this has. For this I used a
>> large guest...