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| author | julie <julielangou@users.noreply.github.com> | 2010-06-24 14:38:30 +0000 |
|---|---|---|
| committer | julie <julielangou@users.noreply.github.com> | 2010-06-24 14:38:30 +0000 |
| commit | 82f05f2dd3e11ff479cfba13b5e5f0e80249abb3 (patch) | |
| tree | 15d102d9b6bbfc062f92e0205603b2c9ca9628ee /SRC/zlalsd.f | |
| parent | ef920e099dd173ef2fe241cbc452530bd4e0a06e (diff) | |
Fix Bug0059
bug report and fix sent by Alexander Kobotov (Intel) on Wed, 23 June 2010 to "lapack@cs.utk.edu".
ZGELSD crashes on large matrices (eq M=N=NHRS>=88), if real workspace allocated exactly as reported on workspace query.
Root cause is wrong estimation of real workspace size in ZLALSA (on path zgelsd->zlalsd->zlalsa). It assumes that RWORK array length should be max( N, (SMLSZ+1)*NRHS*3 ), where SMLSIZ=25. But in fact the function calls zlals0 which requires RWORK to be ( K*(1+NRHS) + 2*NRHS ), where K could be as large as number of columns in matrix A.
The same is actual for CGELSD.
Diffstat (limited to 'SRC/zlalsd.f')
| -rw-r--r-- | SRC/zlalsd.f | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/SRC/zlalsd.f b/SRC/zlalsd.f index a9182f6d..24594c79 100644 --- a/SRC/zlalsd.f +++ b/SRC/zlalsd.f @@ -89,7 +89,8 @@ * (N * NRHS). * * RWORK (workspace) DOUBLE PRECISION array, dimension at least -* (9*N + 2*N*SMLSIZ + 8*N*NLVL + 3*SMLSIZ*NRHS + (SMLSIZ+1)**2), +* (9*N + 2*N*SMLSIZ + 8*N*NLVL + 3*SMLSIZ*NRHS + +* MAX( (SMLSIZ+1)**2, N*(1+NRHS) + 2*NRHS ), * where * NLVL = MAX( 0, INT( LOG_2( MIN( M,N )/(SMLSIZ+1) ) ) + 1 ) * |