pctRunOnAll does not recognize current parallel pool

Question

Chris10116 2019-9-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/480893-pctrunonall-does-not-recognize-current-parallel-pool

评论： Chris10116 2019-9-19

Inside a parfor loop I want to surpress warnings with pctRunOnAll but I get the error message: Cannot execute pctRunOnAll warning_off_WarnIfIllConditioned when a parallel pool does not exist. What should I do?

parfor V_g_i = 1:length(V_g_vec)
pctRunOnAll warning_off_WarnIfIllConditioned
%% Other code
[Vi,~] = eigs(mat,1,10^(-19)); % mat is an ill-conditioned matrix
%% Other code
end

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Answer 1

Edric Ellis 2019-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/480893-pctrunonall-does-not-recognize-current-parallel-pool#answer_392573

You should use pctRunOnAll at the client, i.e. before the start of the loop, like this:

gcp(); % Ensure we have a parallel pool that parfor will use
pctRunOnAll warning_off_WarnIfIllConditioned
parfor V_g_i = 1:length(V_g_vec)
    %% Other code
    [Vi,~] = eigs(mat,1,10^(-19)); % mat is an ill-conditioned matrix
    %% Other code
end