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cmyuiclaude
cmyui
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claude
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Add benchmark suite and request timing instrumentation (#1)
Benchmark suite (make bench) measures operation latencies across all major subsystems: slab allocator, database, string utilities, JSON builder, and HTTP request parsing. Uses ARM64 Generic Timer for nanosecond-precision measurements. Request timing logs wall-clock time for every HTTP request handled by slowapi_handle, printed to UART on completion. Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
1 parent 0cb0a61 commit 180e69a

10 files changed

Lines changed: 1241 additions & 2 deletions

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‎Makefile‎

Lines changed: 30 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -7,10 +7,12 @@ OBJCOPY = aarch64-none-elf-objcopy
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KERNEL_ELF = kernel.elf
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KERNEL_BIN = kernel.bin
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TEST_ELF = kernel_test.elf
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BENCH_ELF = kernel_bench.elf
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# Common source files (shared between server and tests)
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COMMON_SRCS = src/drivers/uart.s \
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src/drivers/virtio.s \
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src/drivers/timer.s \
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src/net/ethernet.s \
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src/net/arp.s \
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src/net/ipv4.s \
@@ -61,11 +63,24 @@ TEST_SRCS = src/test/test_main.s \
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src/app.s
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TEST_OBJS = $(TEST_SRCS:.s=.o)
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# Benchmark sources
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BENCH_SRCS = src/bench/bench_main.s \
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src/bench/bench_harness.s \
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src/bench/bench_slab.s \
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src/bench/bench_db.s \
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src/bench/bench_string.s \
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src/bench/bench_json.s \
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src/bench/bench_request.s \
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$(COMMON_SRCS) \
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$(MEM_DB_SRCS) \
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$(SLOWAPI_SRCS)
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BENCH_OBJS = $(BENCH_SRCS:.s=.o)
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# Flags
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ASFLAGS = -g
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LDFLAGS = -T linker.ld -nostdlib
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.PHONY: all clean run test
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.PHONY: all clean run test bench
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all: $(KERNEL_ELF)
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@@ -75,14 +90,17 @@ $(KERNEL_ELF): $(SERVER_OBJS) linker.ld
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$(TEST_ELF): $(TEST_OBJS) linker.ld
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$(LD) $(LDFLAGS) -o $@ $(TEST_OBJS)
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$(BENCH_ELF): $(BENCH_OBJS) linker.ld
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$(LD) $(LDFLAGS) -o $@ $(BENCH_OBJS)
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$(KERNEL_BIN): $(KERNEL_ELF)
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$(OBJCOPY) -O binary $< $@
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%.o: %.s
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$(AS) $(ASFLAGS) -o $@ $<
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clean:
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rm -f $(SERVER_OBJS) $(TEST_OBJS) $(KERNEL_ELF) $(KERNEL_BIN) $(TEST_ELF)
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rm -f $(SERVER_OBJS) $(TEST_OBJS) $(BENCH_OBJS) $(KERNEL_ELF) $(KERNEL_BIN) $(TEST_ELF) $(BENCH_ELF)
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run: $(KERNEL_ELF)
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qemu-system-aarch64 \
@@ -103,3 +121,13 @@ test: $(TEST_ELF)
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-kernel $(TEST_ELF) \
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-device virtio-net-device,netdev=net0 \
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-netdev user,id=net0
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bench: $(BENCH_ELF)
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qemu-system-aarch64 \
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-machine virt \
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-cpu cortex-a72 \
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-nographic \
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-global virtio-mmio.force-legacy=true \
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-kernel $(BENCH_ELF) \
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-device virtio-net-device,netdev=net0 \
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-netdev user,id=net0

‎src/bench/bench_db.s‎

Lines changed: 187 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,187 @@
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// Database Benchmarks
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.section .text
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.global run_db_benchmarks
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run_db_benchmarks:
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stp x29, x30, [sp, #-16]!
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mov x29, sp
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ldr x0, =section_name
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bl bench_section
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ldr x0, =ctx_db_create
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bl bench_run
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ldr x0, =ctx_db_get
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bl bench_run
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ldr x0, =ctx_db_delete
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bl bench_run
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ldr x0, =ctx_db_list
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bl bench_run
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ldp x29, x30, [sp], #16
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ret
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//=============================================================================
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// Benchmark functions
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//=============================================================================
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// Create + delete a record (self-contained per iteration)
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bench_fn_db_create:
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stp x29, x30, [sp, #-16]!
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mov x29, sp
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ldr x0, =test_record
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mov x1, #8
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bl db_create
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// Delete to keep db clean for next iteration
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bl db_delete
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ldp x29, x30, [sp], #16
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ret
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// Get a record by ID (record created in setup)
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bench_fn_db_get:
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stp x29, x30, [sp, #-16]!
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mov x29, sp
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ldr x0, =db_saved_id
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ldr w0, [x0]
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bl db_get
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ldp x29, x30, [sp], #16
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ret
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// Create + delete (measures delete cost, self-contained)
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bench_fn_db_delete:
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stp x29, x30, [sp, #-16]!
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mov x29, sp
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ldr x0, =test_record
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mov x1, #8
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bl db_create
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bl db_delete
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ldp x29, x30, [sp], #16
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ret
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// Count records
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bench_fn_db_list:
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stp x29, x30, [sp, #-16]!
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mov x29, sp
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bl db_count
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ldp x29, x30, [sp], #16
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ret
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// Setup: reinit mem + db
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bench_db_setup_reinit:
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stp x29, x30, [sp, #-16]!
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mov x29, sp
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bl mem_init
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bl db_init
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ldp x29, x30, [sp], #16
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ret
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// Setup: reinit + create one record (for get benchmark)
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bench_db_setup_create:
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stp x29, x30, [sp, #-16]!
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mov x29, sp
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bl mem_init
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bl db_init
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ldr x0, =test_record
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mov x1, #8
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bl db_create
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ldr x1, =db_saved_id
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str w0, [x1]
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ldp x29, x30, [sp], #16
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ret
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// Setup: reinit + populate 10 records (for list benchmark)
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bench_db_setup_populate:
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stp x29, x30, [sp, #-16]!
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mov x29, sp
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stp x19, xzr, [sp, #-16]!
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bl mem_init
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bl db_init
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mov w19, #10
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.populate_loop:
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cbz w19, .populate_done
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ldr x0, =test_record
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mov x1, #8
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bl db_create
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sub w19, w19, #1
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b .populate_loop
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.populate_done:
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ldp x19, xzr, [sp], #16
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ldp x29, x30, [sp], #16
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ret
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//=============================================================================
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// Benchmark contexts
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//=============================================================================
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.section .data
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.balign 8
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ctx_db_create:
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.quad name_db_create
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.quad bench_fn_db_create
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.quad bench_db_setup_reinit
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.quad 0
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.word 500
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.skip 28
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.balign 8
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ctx_db_get:
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.quad name_db_get
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.quad bench_fn_db_get
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.quad bench_db_setup_create
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.quad 0
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.word 1000
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.skip 28
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.balign 8
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ctx_db_delete:
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.quad name_db_delete
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.quad bench_fn_db_delete
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.quad bench_db_setup_reinit
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.quad 0
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.word 500
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.skip 28
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.balign 8
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ctx_db_list:
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.quad name_db_list
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.quad bench_fn_db_list
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.quad bench_db_setup_populate
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.quad 0
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.word 100
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.skip 28
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.section .rodata
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section_name:
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.asciz "database"
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name_db_create:
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.asciz "db_create"
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name_db_get:
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.asciz "db_get"
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name_db_delete:
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.asciz "db_delete"
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name_db_list:
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.asciz "db_list"
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test_record:
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.ascii "testdata"
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.section .bss
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.balign 4
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db_saved_id:
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.skip 4

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