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Looking further at the CPU loads on systems running large numbers of tasks, the following things helps performance: * Loop on waitpid until there are no processes still waiting * Using select to wait for the cooker pipe to be writable before writing avoiding pointless 100% cpu usage * Only reading from worker pipes that select highlights are readable (Bitbake rev: 9375349e27b08b4d1cfe4825c042d4c82120e00b) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>