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From "Glenn Weidner" <>
Subject RE: [jira] [Updated] (SYSTEMML-1591) Improve efficiency sparse-unsafe cellwise operations
Date Sat, 09 Sep 2017 23:18:13 GMT

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From:	Himanshu Mohan <>
To:	"" <>
Date:	09/08/2017 09:53 PM
Subject:	RE: [jira] [Updated] (SYSTEMML-1591) Improve efficiency
            sparse-unsafe cellwise operations


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-----Original Message-----

From: Glenn Weidner (JIRA) []

Sent: Saturday, September 09, 2017 6:43 AM


Subject: [jira] [Updated] (SYSTEMML-1591) Improve efficiency sparse-unsafe
cellwise operations


Glenn Weidner updated SYSTEMML-1591:


    Fix Version/s:     (was: SystemML 1.0)

                   SystemML 0.15

> Improve efficiency sparse-unsafe cellwise operations

> ----------------------------------------------------


>                 Key: SYSTEMML-1591

>                 URL:

>             Project: SystemML

>          Issue Type: Sub-task

>          Components: Compiler, Runtime

>            Reporter: Matthias Boehm

>            Assignee: Matthias Boehm

>             Fix For: SystemML 0.15



> For sparse-unsafe cellwise operations, we currently iterate over all
cells and use binary search to access the individual values. This is
unnecessarily inefficient to should be reworked in favor of a sequential
scan with gap handling, which would also allow us to consolidate the
different code paths for sparse-safe and -unsafe operations.


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