[LTP] [PATCH] memcg_stress_test.sh: Respect LTP_TIMEOUT_MUL set by user

[Petr Vorel <pvorel@suse.cz>]

Hi Li,

Good point. Something like this could do it:
-LTP_TIMEOUT_MUL=7
+min_timeout=7
+[ -z "$LTP_TIMEOUT_MUL" -o "$LTP_TIMEOUT_MUL" -lt $min_timeout ] && LTP_TIMEOUT_MUL=$min_timeout

Unless we test only integers:
+[ is_int "$LTP_TIMEOUT_MUL" -o "$LTP_TIMEOUT_MUL" -lt $min_timeout ] && LTP_TIMEOUT_MUL=$min_timeout

But that'd require using only integers, while C allows to use floating point
numbers :(. We can
1) either live with the limitation of integers for shell (+ document it)
2) or use awk or bc (but that's external dependency for shell tests (currently
tst_test.sh requires: cut, tr, wc; tst_net.sh requires awk and ip; so I'd be for
awk dependency; dependencies should be documented as well)
3) write simple utility (tst_float_cmp.c) to compare strings for us

Of course, we can test only integers:
+[ is_int "$LTP_TIMEOUT_MUL" -o "$LTP_TIMEOUT_MUL" -lt $min_timeout ] && LTP_TIMEOUT_MUL=$min_timeout

Also, C code requires LTP_TIMEOUT_MUL > 1 in tst_set_timeout().
We don't have this check. Again, adding it brings problem with float number.

Kind regards,
Petr

> On Fri, Aug 30, 2019 at 2:12 AM Petr Vorel <pvorel@suse.cz> wrote:

> > While it's good to increase the default LTP_TIMEOUT_MUL value, give user
> > a chance to change it.

> It's a good proposal, but one thing we need to consider that there is
> possible to pass a small timeout value(<5mins) from the user. So what
> about set a condition judgment which only accepts time value which >=
> 7?

> >  # Each test case runs for 900 secs when everything fine
> >  # therefore the default 5 mins timeout is not enough.

> Here the code comments reminder this.