create new executable, lsm_microbenchmarks. The idea is to bring up the LSM tree a little at a time, and see where the performance falls over.

git-svn-id: svn+ssh://svn.corp.yahoo.com/yahoo/yrl/labs/pnuts/code/logstore@2940 8dad8b1f-cf64-0410-95b6-bcf113ffbcfe

benchmarks/CMakeLists.txt

@@ -1 +1,2 @@
 CREATE_CLIENT_EXECUTABLE(tcpclient_noop)
+CREATE_EXECUTABLE(lsm_microbenchmarks)

benchmarks/lsm_microbenchmarks.cpp

@@ -0,0 +1,66 @@
+/*
+ * lsm_microbenchmarks.cpp
+ *
+ *  Created on: Aug 22, 2011
+ *      Author: sears
+ */
+#include <stasis/common.h>
+#include <stasis/util/time.h>
+#include <stdio.h>
+#include <logserver.h>
+#include <regionAllocator.h>
+
+BEGIN_C_DECLS
+
+int main(int argc, char * argv[]);
+
+END_C_DECLS
+
+enum run_type {
+	ALL = 0
+};
+
+int main (int argc, char * argv[]) {
+	uint64_t mb = 10000; // size of run, in bytes.
+	enum run_type mode = ALL;
+
+	const uint64_t num_pages = mb * ((1024 * 1024) / PAGE_SIZE);
+
+	logtable::init_stasis();
+
+	if(!mode) {
+		int xid = Tbegin();
+		printf("Starting first write of %lld mb\n", (long long)mb);
+		struct timeval start, stop; double elapsed;
+		gettimeofday(&start, 0);
+		for(uint64_t i = 0; i < num_pages; i++) {
+			Page * p = loadUninitializedPage(xid, i);
+			stasis_dirty_page_table_set_dirty((stasis_dirty_page_table_t*)stasis_runtime_dirty_page_table(), p);
+			releasePage(p);
+		}
+		gettimeofday(&stop, 0);
+		elapsed = stasis_timeval_to_double(stasis_subtract_timeval(stop, start));
+		printf("Write (unforced) took %f seconds (%f mb/sec)\n", elapsed, ((double)mb)/elapsed);
+		printf("Starting write of giant datapage\n");
+		gettimeofday(&start, 0);
+		RegionAllocator * alloc = new RegionAllocator(xid, num_pages);
+		DataPage * dp = new DataPage(xid, 10000, alloc);
+		byte * key = (byte*)calloc(100, 1);
+		byte * val = (byte*)calloc(900, 1);
+		datatuple * tup = datatuple::create(key, 100, val, 900);
+		free(key);
+		free(val);
+		while(1) {
+			if(!dp->append(tup)) {
+				break;
+			}
+		}
+		alloc->force_regions(xid);
+		Tcommit(xid);
+		gettimeofday(&stop, 0);
+		elapsed = stasis_timeval_to_double(stasis_subtract_timeval(stop, start));
+		printf("Write (forced) took %f seconds (%f mb/sec)\n", elapsed, ((double)mb)/elapsed);
+	}
+
+	logtable::deinit_stasis();
+}