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Subject: printing pv slow down question

Author: Uri Blass

Date: 05:44:53 08/15/04

I tried movei with 3 options of printing the pv

1)printing the pv only when I have a new pv of more than one move or at the end
of the iteraion(no priniting fail low fail high at the time that they happen)

2)printing pv of one move also when I get fail high but not in case of fail high
of the root move.

3)printing pv of a single ply also when I get fail high or fail low at the root.

Note that I used visual C++6 and I did not use profile based optimization.

I tried the opening position more than one time on my A1000 in console mode(I
tried it more than one time to exclude the possibility of random changes that
are not dependent on the program.

Here are my result of analysis of the opening position:

You can see that there is a slow down of more than 3% from printing the pv more
often if I compare case 1 with case 3 and changes from running the program at
different times do not seem to be significant.


I know that 3% is not much but I do not like to see the program becomes slower
only because of adding some output when the function that calculates the output
are called rarely.

My question is if this problem usually disappear with profile based
optimizations(printf is not used often).


Here is the relevant data(Movei did not change it's mind after having a pv for
e4 at depth 11 so the part of the analysis after the pv with e2e4 is the same in
both 3 cases and I only show that part with times for comparison)

times are given in centiseconds in the 3th field so in the first case in the
first try to run the program the times are 44.37,46.74 100.34 137.34 seconds

Case 1:
try 1
11 25 4437 7473000 e2e4 d7d5 e4d5 d8d5 b1c3 d5e6 g1e2 b8a6 d2d3 c8d7 c1e3 g8f6
11 25 4674 7856781 e2e4 d7d5 e4d5 d8d5 b1c3 d5e6 g1e2 b8a6 d2d3 c8d7 c1e3 g8f6

12 16 10034 17434134 e2e4 e7e5 b1c3 b8c6 g1f3 g8f6 d2d4 e5d4 f3d4 f8c5 d4c6 b7c
6
12 16 13734 23713358 e2e4 e7e5 b1c3 b8c6 g1f3 g8f6 d2d4 e5d4 f3d4 f8c5 d4c6 b7c
6

try 2
11 25 4443 7473000 e2e4 d7d5 e4d5 d8d5 b1c3 d5e6 g1e2 b8a6 d2d3 c8d7 c1e3 g8f6
11 25 4680 7856781 e2e4 d7d5 e4d5 d8d5 b1c3 d5e6 g1e2 b8a6 d2d3 c8d7 c1e3 g8f6
12 16 10041 17434134 e2e4 e7e5 b1c3 b8c6 g1f3 g8f6 d2d4 e5d4 f3d4 f8c5 d4c6 b7c
6
12 16 13740 23713358 e2e4 e7e5 b1c3 b8c6 g1f3 g8f6 d2d4 e5d4 f3d4 f8c5 d4c6 b7c
6

try 3(was done only later after all the tries of other cases)

11 25 4438 7473000 e2e4 d7d5 e4d5 d8d5 b1c3 d5e6 g1e2 b8a6 d2d3 c8d7 c1e3 g8f6
11 25 4675 7856781 e2e4 d7d5 e4d5 d8d5 b1c3 d5e6 g1e2 b8a6 d2d3 c8d7 c1e3 g8f6
12 16 10034 17434134 e2e4 e7e5 b1c3 b8c6 g1f3 g8f6 d2d4 e5d4 f3d4 f8c5 d4c6 b7c
6
12 16 13731 23713358 e2e4 e7e5 b1c3 b8c6 g1f3 g8f6 d2d4 e5d4 f3d4 f8c5 d4c6 b7c
6

Case 2:

try 1

11 25 4493 7473000 e2e4 d7d5 e4d5 d8d5 b1c3 d5e6 g1e2 b8a6 d2d3 c8d7 c1e3 g8f6
11 25 4733 7856781 e2e4 d7d5 e4d5 d8d5 b1c3 d5e6 g1e2 b8a6 d2d3 c8d7 c1e3 g8f6
12 16 10160 17434134 e2e4 e7e5 b1c3 b8c6 g1f3 g8f6 d2d4 e5d4 f3d4 f8c5 d4c6 b7c
6
12 16 13905 23713358 e2e4 e7e5 b1c3 b8c6 g1f3 g8f6 d2d4 e5d4 f3d4 f8c5 d4c6 b7c
6

try 2

11 25 4491 7473000 e2e4 d7d5 e4d5 d8d5 b1c3 d5e6 g1e2 b8a6 d2d3 c8d7 c1e3 g8f6
11 25 4731 7856781 e2e4 d7d5 e4d5 d8d5 b1c3 d5e6 g1e2 b8a6 d2d3 c8d7 c1e3 g8f6
12 16 10184 17434134 e2e4 e7e5 b1c3 b8c6 g1f3 g8f6 d2d4 e5d4 f3d4 f8c5 d4c6 b7c
6
12 16 13929 23713358 e2e4 e7e5 b1c3 b8c6 g1f3 g8f6 d2d4 e5d4 f3d4 f8c5 d4c6 b7c
6

Case 3:

try 1
11 25 4581 7473000 e2e4 d7d5 e4d5 d8d5 b1c3 d5e6 g1e2 b8a6 d2d3 c8d7 c1e3 g8f6
11 25 4827 7856781 e2e4 d7d5 e4d5 d8d5 b1c3 d5e6 g1e2 b8a6 d2d3 c8d7 c1e3 g8f6
12 16 10379 17434134 e2e4 e7e5 b1c3 b8c6 g1f3 g8f6 d2d4 e5d4 f3d4 f8c5 d4c6 b7c
6
12 16 14215 23713358 e2e4 e7e5 b1c3 b8c6 g1f3 g8f6 d2d4 e5d4 f3d4 f8c5 d4c6 b7c
6

try 2

11 25 4580 7473000 e2e4 d7d5 e4d5 d8d5 b1c3 d5e6 g1e2 b8a6 d2d3 c8d7 c1e3 g8f6
11 25 4825 7856781 e2e4 d7d5 e4d5 d8d5 b1c3 d5e6 g1e2 b8a6 d2d3 c8d7 c1e3 g8f6
12 16 10377 17434134 e2e4 e7e5 b1c3 b8c6 g1f3 g8f6 d2d4 e5d4 f3d4 f8c5 d4c6 b7c
6
12 16 14212 23713358 e2e4 e7e5 b1c3 b8c6 g1f3 g8f6 d2d4 e5d4 f3d4 f8c5 d4c6 b7c
6

Uri

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