Wait inside wake_sleeping_threads() for the threads to be
effectively and reliably woken up.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Will be used by future patches. Also:
- Renamed Idle in AllThreadsShouldSleep
- Explicitly inited AllThreadsShouldExit and AllThreadsShouldSleep
in init_thread() instead of use an anonymous global initialization.
- Rewritten idle_loop() while condition to avoid a 'break' statement
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
It is an hidden bug waiting to fire. The main problem is
that ss[ply] is overwritten by search() and qsearch() called
from IID and razoring, so that we cannot hold a pointer to a
local EvalInfo variable.
For instance if we go razoring then we overwrite the pointer
with the address of a variable local to qsearch(), when we return
from qsearch() variable goes out of scope and now ss[ply].evalInfo
holds a stale pointer !
Because we are not looking for troubles we go through the
safe route and we remove it entirely.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
In search routines we use information from previous ply
and init killers two plies ahead.
So for me it seems correct to copy 4 searchstack items
in split:
ply - 1, ply, ply + 1, ply + 2
Because
a) we do not split at root (ply == 0)
b) ply < PLY_MAX and SearchStack size is PLY_MAX_PLUS_2
there should be no risk of underflows or overflows
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
It was only used to control StopOnPonderHit variable.
Now use FailLow variable instead.
Patch has a minor effect on time management when ponder is on.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
noProblemFound condition is never true.
This was verified by running 800 games 1+0 match in 1 CPU computer.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Instead of piece-from-to, in this way it is similar
to what we already do for history.
Almost no change, but seems a bit simpler in this way.
After 995 games at 1+0
Mod vs Orig +207 =596 -192 +5 ELO
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
It seems more standard conformant. Also added a bit of
description directly from Tord.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Futility captures alone does not seem an improvment.
Perhaps is a combination of stand pat + futility that is winning,
so revert for now and continue testing starting from a standard
base until we find the correct receipe.
After 999 games at 1+0
Mod vs Orig +231 0506 -201 +10 ELO
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Not a biggie but is a reduced pruned patch that doesn't
seems to hurt, so it is welcomed ;-)
After 999 games at 1+0
Mod vs Orig +207 =601 -191 +6 ELO
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
At ply == OnePly (common case) we avoid some useless
floating point computation.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Joona new aspiration window. Main idea is to always
research aspiration fail highs/low at the same
ply and use much smaller aspiration window than previously.
Testing result is very positive.
1CPU:
953-1149
4CPU:
545 - 656
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Avoid to take the lock two times in a tight sequence, the first
in get_next_move() and the second to update sp->moves.
Do all with one lock and so retire the now useless locked version
of get_next_move().
Also fix some theorical race due to comparison sp->bestValue < sp->beta
is done out of lock protection. Finally fix another (harmless but time
waster) race that coudl occur because thread_should_stop() is also
called outside of lock protection.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
In debug run with 2 threads it happens to be following
assert after some minutes:
assert(value > -VALUE_INFINITE && value < VALUE_INFINITE);
in search(), line 1615.
I am not able to understand why, anyhow reverted for the moment.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This avoid us to forget some very needed tests now that
futility has changed in a whole big chunk we need to fine
tuning every splitted change.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This will be useful to use gains table in move
ordering along with history table.
No functional change and big code remove.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
