Generating 10 files with 10 process for `dlrm` model takes more than 1 hour with 1% I/O time

[wolfgang-desalvador]

Generating parquet files for dlrm takes 1 hour, with only 1 minute spent in writing.

How to reproduce:

• Use the updated branch which is generating parquet data with the proper size Add parquet configuration options to ConfigArguments and LoadConfig DLIO_local_changes#9
• Generate data for DLRM with 10 processors and 10 files
• Wrap data generation code with cProfile statement in DLIO main.py or simply enable DFTRACER
• Analyze the results (POSIX calls time or write_table time) versus total time

[wolfgang-desalvador]

Proposed fix in mlcommons/DLIO_local_changes#10