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Staggered multinode block cg debugged. Missing global sum.
Code stalls and resumes on KNL at cambridge. Curious. CG iterations 23ms each, then 3200 ms pauses. Mean bandwidth reports as 200MB/s. Comms dominant in the report. However, the time behaviour suggests it is *bursty*.... Could be swap to disk?
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@ -199,7 +199,12 @@ void BlockCGrQsolve(LinearOperatorBase<Field> &Linop, const Field &B, Field &X)
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Linop.HermOp(X, AD);
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tmp = B - AD;
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//std::cout << GridLogMessage << " initial tmp " << norm2(tmp)<< std::endl;
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ThinQRfact (m_rr, m_C, m_Cinv, Q, tmp);
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//std::cout << GridLogMessage << " initial Q " << norm2(Q)<< std::endl;
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//std::cout << GridLogMessage << " m_rr " << m_rr<<std::endl;
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//std::cout << GridLogMessage << " m_C " << m_C<<std::endl;
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//std::cout << GridLogMessage << " m_Cinv " << m_Cinv<<std::endl;
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D=Q;
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std::cout << GridLogMessage<<"BlockCGrQ computed initial residual and QR fact " <<std::endl;
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@ -221,13 +226,15 @@ void BlockCGrQsolve(LinearOperatorBase<Field> &Linop, const Field &B, Field &X)
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MatrixTimer.Start();
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Linop.HermOp(D, Z);
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MatrixTimer.Stop();
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//std::cout << GridLogMessage << " norm2 Z " <<norm2(Z)<<std::endl;
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//4. M = [D^dag Z]^{-1}
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sliceInnerTimer.Start();
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sliceInnerProductMatrix(m_DZ,D,Z,Orthog);
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sliceInnerTimer.Stop();
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m_M = m_DZ.inverse();
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//std::cout << GridLogMessage << " m_DZ " <<m_DZ<<std::endl;
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//5. X = X + D MC
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m_tmp = m_M * m_C;
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sliceMaddTimer.Start();
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