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significantly reduced sparse matrix footprint:

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http://code.opencv.org/issues/2206,
http://code.opencv.org/issues/2924
This commit is contained in:
Vadim Pisarevsky
2015-05-14 23:29:09 +03:00
parent 7dd67f4997
commit 66eb270cf7
2 changed files with 28 additions and 3 deletions
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24
modules/core/test/test_mat.cpp
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@@ -1248,3 +1248,27 @@ TEST(Core_SVD, orthogonality)
ASSERT_LT(norm(mat_U, Mat::eye(2, 2, type), NORM_INF), 1e-5);
}
}
TEST(Core_SparseMat, footprint)
{
int n = 1000000;
int sz[] = { n, n };
SparseMat m(2, sz, CV_64F);
int nodeSize0 = (int)m.hdr->nodeSize;
double dataSize0 = ((double)m.hdr->pool.size() + (double)m.hdr->hashtab.size()*sizeof(size_t))*1e-6;
printf("before: node size=%d bytes, data size=%.0f Mbytes\n", nodeSize0, dataSize0);
for (int i = 0; i < n; i++)
{
m.ref<double>(i, i) = 1;
}
double dataSize1 = ((double)m.hdr->pool.size() + (double)m.hdr->hashtab.size()*sizeof(size_t))*1e-6;
double threshold = (n*nodeSize0*1.6 + n*2.*sizeof(size_t))*1e-6;
printf("after: data size=%.0f Mbytes, threshold=%.0f MBytes\n", dataSize1, threshold);
ASSERT_LE((int)m.hdr->nodeSize, 32);
ASSERT_LE(dataSize1, threshold);
}