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RRZE-HPC / kerncraft

Loop Kernel Analysis and Performance Modeling Toolkit
GNU Affero General Public License v3.0
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Cache simulation "explodes" with full caching #89

Closed cod3monk closed 5 years ago

cod3monk commented 6 years ago

When executing this code with -D M1 128 -D K 128 -D N2 128 -D N1 128 -p ECMData, the cache simulator detects full caching opportunity and tries to simulate all loop iterations (268.435.456 with 805.306.368 addresses). That is not feasible and needs to be solved some other way.

double a[M1][K];
double b[K][N2][N1];
double c[M1][N1][N2];
double s;

for(int m1=1; m1<M1-1; ++m1)
    for(int n1=1; n1<N1-1; ++n1)
        for(int n2=1; n2<N2-1; ++n2)
            for(int k=1; k<K-1; ++k)
                c[m1][n1][n2] += a[m1][k] + b[k][n2][n1];

Code provided by @springer13

springer13 commented 6 years ago

thanks for looking into it. I'll keep an eye on this post.

cod3monk commented 5 years ago

I believe this issue has resolved since. Can you confirm? I am unable to reproduce the issue with the lastest git version.