author | František Kučera <franta-hg@frantovo.cz> |
Sun, 25 Apr 2021 20:30:53 +0200 | |
branch | v_0 |
changeset 91 | cb1adcd17d0c |
parent 64 | 7ba9d703fadb |
permissions | -rw-r--r-- |
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/** |
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* Relational pipes |
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* Copyright © 2020 František Kučera (Frantovo.cz, GlobalCode.info) |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, version 3 of the License. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#include "streamlet-common.h" |
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#include <unistd.h> |
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/** |
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* This streamlet is useful only for debugging or study purposes. |
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* |
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* It provides two attributes: |
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* - pid_streamlet: getpid() |
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* - pid_worker: getppid() |
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* |
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* Can be used for studying how the parallelism works: |
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* - Each instance of streamlet (each --streamlet pid) will have different pid_streamlet. |
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* - Each worker (their number = X in --parallelism X) will have different pid_worker. |
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* |
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* So we can check how evenly the work has been distributed across processes (e.g. do some GROUP BY in SQL). |
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*/ |
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class PidStreamlet : public Streamlet { |
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std::vector<AttributeMetadata> getOutputAttributesMetadata() override { |
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std::vector<AttributeMetadata> oam; |
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int i = 0; |
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oam.push_back({getAlias(i++, L"pid_streamlet"), INTEGER}); |
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oam.push_back({getAlias(i++, L"pid_worker"), INTEGER}); |
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return oam; |
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} |
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std::vector<OutputAttribute> getOutputAttributes() override { |
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std::vector<OutputAttribute> oa; |
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oa.push_back({std::to_wstring(getpid()), false}); |
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oa.push_back({std::to_wstring(getppid()), false}); |
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return oa; |
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} |
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}; |
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STREAMLET_RUN(PidStreamlet) |