HDFS Benchmark — GLYPH v0.1

Dataset:

• HDFS.log
• size: 1.5GB
• source: Loghub / HDFS dataset

Query set:

• 100 unique blk_* IDs extracted from the dataset

Baseline:

time while read -r q; do
  grep -F "$q" HDFS.log > /dev/null
done < hdfs_queries.txt

Result:

• grep -F loop: 14.385 sec

GLYPH index:

• SA32u built
• BWT built
• FM-index built
• persistent backend: query_fm_server_v1

Persistent FM benchmark:

• queries: 100
• total_time_sec: 0.001526
• avg_ms_per_query: 0.015261

Interpretation:

GLYPH is not faster than grep for a single ad-hoc scan.

GLYPH is designed for repeated exact queries over pre-indexed static data. In that mode, it avoids rescanning the corpus and uses the FM-index backend directly.