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Add per-kernel instruction histogram option to tracer tool #576

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Add per-kernel instruction histogram option to tracer tool #576

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42 changes: 42 additions & 0 deletions util/tracer_nvbit/tracer_tool/tracer_tool.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,7 @@ bool skip_flag = false;
uint32_t instr_begin_interval = 0;
uint32_t instr_end_interval = UINT32_MAX;
int verbose = 0;
int inst_histogram = 0;
int enable_compress = 1;
int print_core_id = 0;
int exclude_pred_off = 1;
Expand Down Expand Up @@ -138,6 +139,8 @@ std::unordered_map<CUcontext, int> ctx_kernelid;
std::unordered_map<CUcontext, FILE *> ctx_resultsFile;
std::unordered_map<CUcontext, std::string> ctx_current_kernel_name;

std::unordered_map<std::string, uint64_t> inst_usage_counters;

std::string kernel_ranges = "";

struct KernelRange {
Expand Down Expand Up @@ -308,6 +311,9 @@ void nvbit_at_init() {
"and cuProfilerStop. If set to 0, DYNAMIC_KERNEL_RANGE options have no "
"effect");
GET_VAR_INT(verbose, "TOOL_VERBOSE", 0, "Enable verbosity inside the tool");
GET_VAR_INT(
inst_histogram, "HISTOGRAM", 0,
"Add a histogram with instruction counts to each generated trace file");
GET_VAR_INT(enable_compress, "TOOL_COMPRESS", 1, "Enable traces compression");
GET_VAR_INT(print_core_id, "TOOL_TRACE_CORE", 0,
"write the core id in the traces");
Expand Down Expand Up @@ -845,6 +851,40 @@ static void leave_kernel_launch(CUcontext ctx, CUfunction func) {
fclose(statsFile);

if (!stop_report) {
if (inst_histogram) {
// Dump instruction histogram (if requested)
std::vector<const std::pair<const std::string, uint64_t> *>
sorted_inst_usage;
sorted_inst_usage.reserve(inst_usage_counters.size());
int max_key_chars = 11;
for (const auto &kv : inst_usage_counters) {
sorted_inst_usage.push_back(&kv);
max_key_chars = std::max(max_key_chars, (int)kv.first.size());
}

std::sort(sorted_inst_usage.begin(), sorted_inst_usage.end(),
[](auto a, auto b) { return a->second > b->second; });

if (!sorted_inst_usage.empty()) {
int maxValue = sorted_inst_usage.front()->second;
int max_value_chars = std::max(9, (int)std::to_string(maxValue).size());
fprintf(ctx_resultsFile[ctx], "# %-*s%-*sHISTOGRAM\n",
max_key_chars + 1, "INSTRUCTION", max_value_chars + 1,
"FREQUENCY");
for (const auto *kv : sorted_inst_usage) {
int count = std::max(1, (int)(20.0 * kv->second / maxValue));
std::string bar;
bar.reserve(count * 3);
for (int i = 0; i < count; ++i)
bar += "█";
fprintf(ctx_resultsFile[ctx], "# %-*s%-*lu%s\n", max_key_chars + 1,
kv->first.c_str(), max_value_chars + 1, kv->second,
bar.c_str());
}
}
inst_usage_counters.clear();
}

if (!xz_compress_trace) {
fclose(ctx_resultsFile[ctx]);
} else {
Expand Down Expand Up @@ -1237,6 +1277,8 @@ void *recv_thread_fun(void *args) {
}

std::string opcode = id_to_opcode_map[trace->opcode_id];
if (inst_histogram)
inst_usage_counters[opcode] += 1;
// only dump reg val if opcode contains: BAR
bool dump_reg_val = false;
if (allow_reg_val_tracing &&
Expand Down