[SQU] Could anyone can explain this log message?

Hi,everyone

   I found one messages in my log files,I don't know what it means,would everyone like to explain it for me?

   Log messages:
       Unable to allocate 4096 blocks of 1bytes(I don't understand this sentence!!!)
       squid parent:child process 226 exited with status 1
                    child process 2409 started

Tks in advance
kyue

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