Public bug reported:
QEMU in user-mode (linux-user or bsd-user) has no way to get the
equivalent of the "-icount" argument found in softmmu mode.
It is true that some system calls in user-mode can prevent deterministic
execution, but it would be very simple to patch time-related syscalls to
return a number based on icount when in deterministic mode.
Putting both changes together (icount + time-related syscalls) would
cover the needs for deterministic execution of most benchmarks (i.e.,
those not interacting with the network or other programs in the system).
** Affects: qemu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1652373
Title:
User-mode QEMU is not deterministic
Status in QEMU:
New
Bug description:
QEMU in user-mode (linux-user or bsd-user) has no way to get the
equivalent of the "-icount" argument found in softmmu mode.
It is true that some system calls in user-mode can prevent
deterministic execution, but it would be very simple to patch time-
related syscalls to return a number based on icount when in
deterministic mode.
Putting both changes together (icount + time-related syscalls) would
cover the needs for deterministic execution of most benchmarks (i.e.,
those not interacting with the network or other programs in the
system).
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