scalability issues with memaslap client

[m6w6]

• Reported as: lp:1721048
• Reported by: lp:~kkourt
• Reported at: 2017-10-03T14:30:30Z

Imported from Launchpad using lp2gh.

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Multi-threaded scalability of memaslap is constrained by:

• use of locks in statistics
• use of rand() function that has an internal lock

[m6w6]

• Comment by: lp:~kkourt:
• Created at: 2017-10-03T14:32:36Z

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This patch changes the memaslap statistics to be per-thread, avoiding the need to synchronize when updating them.

[m6w6]

• Comment by: lp:~kkourt:
• Created at: 2017-10-03T14:34:26Z

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This patch replaces rand() with rand_r(), improving the scalability of memaslap. (The glibc implementation of rand() takes an internal lock.)