Getting Segmentation fault when using param enable_pref_large_core.

[pulkit15158]

Hello,
I am getting Segmentation fault when using Hardware Stride prefetcher. I am uusing param_x86 file along with enable_pref_large_core 1.

[hyesoon]

oh we haven't tested hardware stride prefetcher for a long time. Can you share your params.in file and the testing trace file name?

[pulkit15158]

Hi,

I am using the following the params.in and trace file.

params.in.txt

Actually I am not able to attach trace file because of the size limit. Can you please test the prefetcher utility on any trace file and attached params.in

I am getting segmentation fault.

[pulkit15158]

Hello, I tried multiple other things but still the same issue

[jiashenC]

Hardware prefetcher gets seg fault because it accesses memory module before it is initialized. So the hardware prefetcher gets an nullptr.

It faults here.

macsim/src/pref_common.cc

Line 106 in c12eacf

m_shift_bit = LOG2_DCACHE_LINE_SIZE;

Core is initialized before memory, but hardware prefetcher access memory first.

macsim/src/macsim.cc

Line 734 in c12eacf

init_cores(m_num_sim_cores);

We will introduce a fix for this.

[pulkit15158]

Hi, So if I set my m_shift_bit = 6(log 2 of Dcache line size) in the code, it will solve the problem correct ?

Thanks for the update 👍