Call bundled program will hang the program with a piped stdin. The larger the file, the longer the time it takes.

[dyxushuai]

Issue description

For example:

$ cat a-large-file | my-ego-program

This will take long time, more than 10minutes with CPU usage

And the main thread block's backtrace:

Others like:

The strace output:

After I changed the piped stdin to FD based stdin, it works as expect!

[thomasten]

Hi @dyxushuai,
This is because I/O from SGX enclaves require ocalls, which are expensive. You can check this by comparing it against cat a-large-file | OE_SIMULATION=1 my-ego-program, which should be considerably faster.