Add TPC-H instructions to PERF.md

PERF.md

@@ -32,3 +32,28 @@ make clickbench
 
 This will build Limbo in release mode, create a database, and run the benchmarks with a small subset of the Clickbench dataset.
 It will run the queries for both Limbo and SQLite, and print the results.
+
+## TPC-H
+
+1. Clone the Taratool TPC-H benchmarking tool:
+
+```shell
+git clone git@github.com:tarantool/tpch.git
+```
+
+2. Patch the benchmark runner script:
+
+```patch
+diff --git a/bench_queries.sh b/bench_queries.sh
+index 6b894f9..c808e9a 100755
+--- a/bench_queries.sh
++++ b/bench_queries.sh
+@@ -4,7 +4,7 @@ function check_q {
+        local query=queries/$*.sql
+        (
+                echo $query
+-               time ( sqlite3 TPC-H.db < $query  > /dev/null )
++               time ( ../../limbo/target/release/limbo -m list TPC-H.db < $query  > /dev/null )
+        )
+ }
+```