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Add aggregation support

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commit d5bd50b5f0cae05b0d9442156dc0c5b11311f7bc 1 parent 20e9d9e
@bcantrill bcantrill authored
View
6 README
@@ -3,7 +3,7 @@ dtrace, a node.js addon for controlling DTrace enablings
--------------------------------------------------------
This is a simple (and, for the moment, crude) addon to provide native
-libdtrace to node.js programs. Currently, only the most basic DTrace
-enablings are supported -- it doesn't support rather major functionality
-like aggregations and error handling.
+libdtrace to node.js programs, supporting basic enablings (including
+aggregations). Currently, esoteric actions are not supported -- this is
+not designed to allow a drop-in replacement for dtrace(1).
View
11 example.js
@@ -2,10 +2,19 @@ var sys = require('sys');
var libdtrace = require('libdtrace');
var dtp = new libdtrace.Consumer();
-dtp.strcompile('BEGIN { trace("hello world"); }');
+var prog = 'BEGIN { trace("hello world"); }\n'
+prog += 'BEGIN { @["hello"] = sum(1); @["world"] = sum(2); }'
+
+dtp.strcompile(prog);
+
dtp.go();
dtp.consume(function (probe, rec) {
sys.puts(sys.inspect(probe));
sys.puts(sys.inspect(rec));
});
+
+dtp.aggwalk(function (varid, key, value) {
+ sys.puts(sys.inspect(key));
+ sys.puts(sys.inspect(value));
+});
View
381 libdtrace.cc
@@ -6,6 +6,17 @@
#include <errno.h>
#include <string>
#include <vector>
+
+/*
+ * Sadly, libelf refuses to compile if _FILE_OFFSET_BITS has been manually
+ * jacked to 64 on a 32-bit compile. In this case, we just manually set it
+ * back to 32.
+ */
+#if defined(_ILP32) && (_FILE_OFFSET_BITS != 32)
+#undef _FILE_OFFSET_BITS
+#define _FILE_OFFSET_BITS 32
+#endif
+
#include <dtrace.h>
using namespace v8;
@@ -22,13 +33,23 @@ class DTraceConsumer : node::ObjectWrap {
Handle<Value> error(const char *fmt, ...);
Handle<Value> badarg(const char *msg);
+ const char *action(const dtrace_recdesc_t *, char *, int);
+
+ Local<Array> *ranges_cached(dtrace_aggvarid_t);
+ Local<Array> *ranges_cache(dtrace_aggvarid_t, Local<Array> *);
+ Local<Array> *ranges_quantize(dtrace_aggvarid_t);
+ Local<Array> *ranges_lquantize(dtrace_aggvarid_t, uint64_t);
static int consume(const dtrace_probedata_t *data,
const dtrace_recdesc_t *rec, void *arg);
+ static int aggwalk(const dtrace_aggdata_t *agg, void *arg);
static int bufhandler(const dtrace_bufdata_t *bufdata, void *arg);
static Handle<Value> New(const Arguments& args);
static Handle<Value> Consume(const Arguments& args);
+ static Handle<Value> Aggwalk(const Arguments& args);
+ static Handle<Value> Aggmin(const Arguments& args);
+ static Handle<Value> Aggmax(const Arguments& args);
static Handle<Value> Strcompile(const Arguments& args);
static Handle<Value> Setopt(const Arguments& args);
static Handle<Value> Go(const Arguments& args);
@@ -38,8 +59,10 @@ class DTraceConsumer : node::ObjectWrap {
dtrace_hdl_t *dtc_handle;
static Persistent<FunctionTemplate> dtc_templ;
const Arguments *dtc_args;
- Local<Function> dtc_consume;
+ Local<Function> dtc_callback;
Handle<Value> dtc_error;
+ Local<Array> *dtc_ranges;
+ dtrace_aggvarid_t dtc_ranges_varid;
};
Persistent<FunctionTemplate> DTraceConsumer::dtc_templ;
@@ -61,10 +84,15 @@ DTraceConsumer::DTraceConsumer() : node::ObjectWrap()
if (dtrace_handle_buffered(dtp, DTraceConsumer::bufhandler, NULL) == -1)
throw (dtrace_errmsg(dtp, dtrace_errno(dtp)));
+
+ dtc_ranges = NULL;
};
DTraceConsumer::~DTraceConsumer()
{
+ if (dtc_ranges != NULL)
+ delete [] dtc_ranges;
+
dtrace_close(dtc_handle);
}
@@ -85,6 +113,12 @@ DTraceConsumer::Initialize(Handle<Object> target)
NODE_SET_PROTOTYPE_METHOD(dtc_templ, "go", DTraceConsumer::Go);
NODE_SET_PROTOTYPE_METHOD(dtc_templ, "consume",
DTraceConsumer::Consume);
+ NODE_SET_PROTOTYPE_METHOD(dtc_templ, "aggwalk",
+ DTraceConsumer::Aggwalk);
+ NODE_SET_PROTOTYPE_METHOD(dtc_templ, "aggmin",
+ DTraceConsumer::Aggmin);
+ NODE_SET_PROTOTYPE_METHOD(dtc_templ, "aggmax",
+ DTraceConsumer::Aggmax);
NODE_SET_PROTOTYPE_METHOD(dtc_templ, "stop", DTraceConsumer::Stop);
target->Set(String::NewSymbol("Consumer"), dtc_templ->GetFunction());
@@ -107,6 +141,54 @@ DTraceConsumer::New(const Arguments& args)
return (args.This());
}
+const char *
+DTraceConsumer::action(const dtrace_recdesc_t *rec, char *buf, int size)
+{
+ static struct {
+ dtrace_actkind_t action;
+ const char *name;
+ } act[] = {
+ { DTRACEACT_NONE, "<none>" },
+ { DTRACEACT_DIFEXPR, "<DIF expression>" },
+ { DTRACEACT_EXIT, "exit()" },
+ { DTRACEACT_PRINTF, "printf()" },
+ { DTRACEACT_PRINTA, "printa()" },
+ { DTRACEACT_LIBACT, "<library action>" },
+ { DTRACEACT_USTACK, "ustack()" },
+ { DTRACEACT_JSTACK, "jstack()" },
+ { DTRACEACT_UMOD, "umod()" },
+ { DTRACEACT_UADDR, "uaddr()" },
+ { DTRACEACT_STOP, "stop()" },
+ { DTRACEACT_RAISE, "raise()" },
+ { DTRACEACT_SYSTEM, "system()" },
+ { DTRACEACT_FREOPEN, "freopen()" },
+ { DTRACEACT_STACK, "stack()" },
+ { DTRACEACT_SYM, "sym()" },
+ { DTRACEACT_MOD, "mod()" },
+ { DTRACEAGG_COUNT, "count()" },
+ { DTRACEAGG_MIN, "min()" },
+ { DTRACEAGG_MAX, "max()" },
+ { DTRACEAGG_AVG, "avg()" },
+ { DTRACEAGG_SUM, "sum()" },
+ { DTRACEAGG_STDDEV, "stddev()" },
+ { DTRACEAGG_QUANTIZE, "quantize()" },
+ { DTRACEAGG_LQUANTIZE, "lquantize()" },
+ { DTRACEACT_NONE, NULL },
+ };
+
+ dtrace_actkind_t action = rec->dtrd_action;
+ int i;
+
+ for (i = 0; act[i].name != NULL; i++) {
+ if (act[i].action == action)
+ return (act[i].name);
+ }
+
+ (void) snprintf(buf, size, "<unknown action 0x%x>", action);
+
+ return (buf);
+}
+
Handle<Value>
DTraceConsumer::error(const char *fmt, ...)
{
@@ -250,13 +332,16 @@ DTraceConsumer::consume(const dtrace_probedata_t *data,
if (rec == NULL) {
Local<Value> argv[1] = { probe };
- dtc->dtc_consume->Call(dtc->dtc_args->This(), 1, argv);
+ dtc->dtc_callback->Call(dtc->dtc_args->This(), 1, argv);
return (DTRACE_CONSUME_NEXT);
}
if (rec->dtrd_action != DTRACEACT_DIFEXPR) {
- dtc->dtc_error = dtc->error("unsupported action type %d "
- "in record for %s:%s:%s:%s\n", rec->dtrd_action,
+ char errbuf[256];
+
+ dtc->dtc_error = dtc->error("unsupported action %s "
+ "in record for %s:%s:%s:%s\n",
+ dtc->action(rec, errbuf, sizeof (errbuf)),
pd->dtpd_provider, pd->dtpd_mod,
pd->dtpd_func, pd->dtpd_name);
return (DTRACE_CONSUME_ABORT);
@@ -290,7 +375,7 @@ DTraceConsumer::consume(const dtrace_probedata_t *data,
Local<Value> argv[2] = { probe, record };
- dtc->dtc_consume->Call(dtc->dtc_args->This(), 2, argv);
+ dtc->dtc_callback->Call(dtc->dtc_args->This(), 2, argv);
return (rec == NULL ? DTRACE_CONSUME_NEXT : DTRACE_CONSUME_THIS);
}
@@ -305,18 +390,298 @@ DTraceConsumer::Consume(const Arguments& args)
if (!args[0]->IsFunction())
return (dtc->badarg("expected function as argument"));
- dtc->dtc_consume = Local<Function>::Cast(args[0]);
+ dtc->dtc_callback = Local<Function>::Cast(args[0]);
dtc->dtc_args = &args;
- dtc->dtc_error = Undefined();
+ dtc->dtc_error = Null();
status = dtrace_work(dtp, NULL, NULL, DTraceConsumer::consume, dtc);
- if (status == -1 && !dtc->dtc_error->IsUndefined())
+ if (status == -1 && !dtc->dtc_error->IsNull())
return (dtc->dtc_error);
return (Undefined());
}
+/*
+ * Caching the quantized ranges improves performance substantially if the
+ * aggregations have many disjoing keys. Note that we only cache a single
+ * aggregation variable; programs that have more than one aggregation variable
+ * may see significant degradations in performance. (If this is a common
+ * case, this cache should clearly be expanded.)
+ */
+Local<Array> *
+DTraceConsumer::ranges_cached(dtrace_aggvarid_t varid)
+{
+ if (varid == dtc_ranges_varid)
+ return (dtc_ranges);
+
+ return (NULL);
+}
+
+Local<Array> *
+DTraceConsumer::ranges_cache(dtrace_aggvarid_t varid, Local<Array> *ranges)
+{
+ if (dtc_ranges != NULL)
+ delete [] dtc_ranges;
+
+ dtc_ranges = ranges;
+ dtc_ranges_varid = varid;
+
+ return (ranges);
+}
+
+Local<Array> *
+DTraceConsumer::ranges_quantize(dtrace_aggvarid_t varid)
+{
+ int64_t min, max;
+ Local<Array> *ranges;
+ int i;
+
+ if ((ranges = ranges_cached(varid)) != NULL)
+ return (ranges);
+
+ ranges = new Local<Array>[DTRACE_QUANTIZE_NBUCKETS];
+
+ for (i = 0; i < DTRACE_QUANTIZE_NBUCKETS; i++) {
+ ranges[i] = Array::New(2);
+
+ if (i < DTRACE_QUANTIZE_ZEROBUCKET) {
+ /*
+ * If we're less than the zero bucket, our range
+ * extends from
+ */
+ min = i > 0 ? DTRACE_QUANTIZE_BUCKETVAL(i - 1) + 1 :
+ INT64_MIN;
+ max = DTRACE_QUANTIZE_BUCKETVAL(i);
+ } else if (i == DTRACE_QUANTIZE_ZEROBUCKET) {
+ min = max = 0;
+ } else {
+ min = DTRACE_QUANTIZE_BUCKETVAL(i);
+ max = i < DTRACE_QUANTIZE_NBUCKETS - 1 ?
+ DTRACE_QUANTIZE_BUCKETVAL(i + 1) - 1 :
+ INT64_MAX;
+ }
+
+ ranges[i]->Set(0, Number::New(min));
+ ranges[i]->Set(1, Number::New(max));
+ }
+
+ return (ranges_cache(varid, ranges));
+}
+
+Local<Array> *
+DTraceConsumer::ranges_lquantize(dtrace_aggvarid_t varid,
+ const uint64_t arg)
+{
+ int64_t min, max;
+ Local<Array> *ranges;
+ int32_t base;
+ uint16_t step, levels;
+ int i;
+
+ if ((ranges = ranges_cached(varid)) != NULL)
+ return (ranges);
+
+ base = DTRACE_LQUANTIZE_BASE(arg);
+ step = DTRACE_LQUANTIZE_STEP(arg);
+ levels = DTRACE_LQUANTIZE_LEVELS(arg);
+
+ ranges = new Local<Array>[levels + 2];
+
+ for (i = 0; i <= levels + 1; i++) {
+ ranges[i] = Array::New(2);
+
+ min = i == 0 ? INT64_MIN : base + ((i - 1) * step);
+ max = i > levels ? INT64_MAX : base + (i * step) - 1;
+
+ ranges[i]->Set(0, Number::New(min));
+ ranges[i]->Set(1, Number::New(max));
+ }
+
+ return (ranges_cache(varid, ranges));
+}
+
+int
+DTraceConsumer::aggwalk(const dtrace_aggdata_t *agg, void *arg)
+{
+ DTraceConsumer *dtc = (DTraceConsumer *)arg;
+ const dtrace_aggdesc_t *aggdesc = agg->dtada_desc;
+ const dtrace_recdesc_t *aggrec;
+ Local<Value> id = Integer::New(aggdesc->dtagd_varid), val;
+ Local<Array> key;
+ char errbuf[256];
+ int i;
+
+ /*
+ * We expect to have both a variable ID and an aggregation value here;
+ * if we have fewer than two records, something is deeply wrong.
+ */
+ assert(aggdesc->dtagd_nrecs >= 2);
+ key = Array::New(aggdesc->dtagd_nrecs - 2);
+
+ for (i = 1; i < aggdesc->dtagd_nrecs - 1; i++) {
+ const dtrace_recdesc_t *rec = &aggdesc->dtagd_rec[i];
+ caddr_t addr = agg->dtada_data + rec->dtrd_offset;
+ Local<Value> datum;
+
+ if (rec->dtrd_action != DTRACEACT_DIFEXPR) {
+ dtc->dtc_error = dtc->error("unsupported action %s "
+ "as key #%d in aggregation \"%s\"\n",
+ dtc->action(rec, errbuf, sizeof (errbuf)), i,
+ aggdesc->dtagd_name);
+ return (DTRACE_AGGWALK_ERROR);
+ }
+
+ switch (rec->dtrd_size) {
+ case sizeof (uint64_t):
+ datum = Number::New(*((int64_t *)addr));
+ break;
+
+ case sizeof (uint32_t):
+ datum = Integer::New(*((int32_t *)addr));
+ break;
+
+ case sizeof (uint16_t):
+ datum = Integer::New(*((uint16_t *)addr));
+ break;
+
+ case sizeof (uint8_t):
+ datum = Integer::New(*((uint8_t *)addr));
+ break;
+
+ default:
+ datum = String::New((const char *)addr);
+ }
+
+ key->Set(i - 1, datum);
+ }
+
+ aggrec = &aggdesc->dtagd_rec[aggdesc->dtagd_nrecs - 1];
+
+ switch (aggrec->dtrd_action) {
+ case DTRACEAGG_COUNT:
+ case DTRACEAGG_MIN:
+ case DTRACEAGG_MAX:
+ case DTRACEAGG_AVG:
+ case DTRACEAGG_SUM: {
+ caddr_t addr = agg->dtada_data + aggrec->dtrd_offset;
+
+ assert(aggrec->dtrd_size == sizeof (uint64_t));
+ val = Number::New(*((int64_t *)addr));
+ break;
+ }
+
+ case DTRACEAGG_QUANTIZE: {
+ Local<Array> quantize = Array::New();
+ const int64_t *data = (int64_t *)(agg->dtada_data +
+ aggrec->dtrd_offset);
+ Local<Array> *ranges, datum;
+ int i, j = 0;
+
+ ranges = dtc->ranges_quantize(aggdesc->dtagd_varid);
+
+ for (i = 0; i < DTRACE_QUANTIZE_NBUCKETS; i++) {
+ if (!data[i])
+ continue;
+
+ datum = Array::New(2);
+ datum->Set(0, ranges[i]);
+ datum->Set(1, Number::New(data[i]));
+
+ quantize->Set(j++, datum);
+ }
+
+ val = quantize;
+ break;
+ }
+
+ case DTRACEAGG_LQUANTIZE: {
+ Local<Array> lquantize = Array::New();
+ const int64_t *data = (int64_t *)(agg->dtada_data +
+ aggrec->dtrd_offset);
+ Local<Array> *ranges, datum;
+ int i, j = 0;
+
+ uint64_t arg = *data++;
+ uint16_t levels = DTRACE_LQUANTIZE_LEVELS(arg);
+
+ ranges = dtc->ranges_lquantize(aggdesc->dtagd_varid, arg);
+
+ for (i = 0; i <= levels + 1; i++) {
+ if (!data[i])
+ continue;
+
+ datum = Array::New(2);
+ datum->Set(0, ranges[i]);
+ datum->Set(1, Number::New(data[i]));
+
+ lquantize->Set(j++, datum);
+ }
+
+ val = lquantize;
+ break;
+ }
+
+ default:
+ dtc->dtc_error = dtc->error("unsupported aggregating action "
+ " %s in aggregation \"%s\"\n", dtc->action(aggrec, errbuf,
+ sizeof (errbuf)), aggdesc->dtagd_name);
+ return (DTRACE_AGGWALK_ERROR);
+ }
+
+ Local<Value> argv[3] = { id, key, val };
+ dtc->dtc_callback->Call(dtc->dtc_args->This(), 3, argv);
+
+ return (DTRACE_AGGWALK_REMOVE);
+}
+
+Handle<Value>
+DTraceConsumer::Aggwalk(const Arguments& args)
+{
+ HandleScope scope;
+ DTraceConsumer *dtc = ObjectWrap::Unwrap<DTraceConsumer>(args.Holder());
+ dtrace_hdl_t *dtp = dtc->dtc_handle;
+
+ if (!args[0]->IsFunction())
+ return (dtc->badarg("expected function as argument"));
+
+ dtc->dtc_callback = Local<Function>::Cast(args[0]);
+ dtc->dtc_args = &args;
+ dtc->dtc_error = Null();
+
+ if (dtrace_status(dtp) == -1) {
+ return (dtc->error("couldn't get status: %s\n",
+ dtrace_errmsg(dtp, dtrace_errno(dtp))));
+ }
+
+ if (dtrace_aggregate_snap(dtp) == -1) {
+ return (dtc->error("couldn't snap aggregate: %s\n",
+ dtrace_errmsg(dtp, dtrace_errno(dtp))));
+ }
+
+ if (dtrace_aggregate_walk(dtp, DTraceConsumer::aggwalk, dtc) == -1) {
+ if (!dtc->dtc_error->IsNull())
+ return (dtc->dtc_error);
+
+ return (dtc->error("couldn't walk aggregate: %s\n",
+ dtrace_errmsg(dtp, dtrace_errno(dtp))));
+ }
+
+ return (Undefined());
+}
+
+Handle<Value>
+DTraceConsumer::Aggmin(const Arguments& args)
+{
+ return (Number::New(INT64_MIN));
+}
+
+Handle<Value>
+DTraceConsumer::Aggmax(const Arguments& args)
+{
+ return (Number::New(INT64_MAX));
+}
+
extern "C" void
init (Handle<Object> target)
{
View
65 tests/test-aggregation.js
@@ -0,0 +1,65 @@
+var sys = require('sys');
+var libdtrace = require('libdtrace');
+var assert = require('assert');
+
+dtp = new libdtrace.Consumer();
+dtp.strcompile('BEGIN { @["foo", "bar", 9904, 61707] = count(); }');
+
+dtp.go();
+
+dtp.aggwalk(function (varid, key, val) {
+ assert.equal(varid, 1);
+ assert.ok(key instanceof Array, 'expected key to be an array');
+ assert.equal(key.length, 4);
+ assert.equal(key[0], "foo");
+ assert.equal(key[1], "bar");
+ assert.equal(key[2], 9904);
+ assert.equal(key[3], 61707);
+ assert.equal(val, 1);
+});
+
+dtp.aggwalk(function (varid, key, val) {
+ assert.ok(false, 'did not expect to find aggregation contents');
+});
+
+dtp = new libdtrace.Consumer();
+
+prog = 'BEGIN\n{\n';
+
+for (i = -32; i < 32; i++)
+ prog += '\t@ = quantize(' + i + ');\n';
+
+prog += '}\n';
+
+sys.puts(prog);
+
+dtp.strcompile(prog);
+
+dtp.go();
+
+dtp.aggwalk(function (varid, key, val) {
+ var expected = [
+ [ [ -63, -32 ], 1 ],
+ [ [ -31, -16 ], 16 ],
+ [ [ -15, -8 ], 8 ],
+ [ [ -7, -4 ], 4 ],
+ [ [ -3, -2 ], 2 ],
+ [ [ -1, -1 ], 1 ],
+ [ [ 0, 0 ], 1 ],
+ [ [ 1, 1 ], 1 ],
+ [ [ 2, 3 ], 2 ],
+ [ [ 4, 7 ], 4 ],
+ [ [ 8, 15 ], 8 ],
+ [ [ 16, 31 ], 16 ],
+ ];
+
+ assert.equal(varid, 1);
+ assert.ok(key instanceof Array, 'expected key to be an array');
+ assert.equal(key.length, 0);
+ assert.ok(val instanceof Array, 'expected val to be an array');
+ assert.deepEqual(expected, val);
+ sys.puts(sys.inspect(val));
+});
+
+delete dtp;
+
View
65 tests/test-footprint.js
@@ -0,0 +1,65 @@
+var sys = require('sys');
+var libdtrace = require('libdtrace');
+var assert = require('assert');
+
+var tests = [
+ 'tick-1000hz { @a = quantize(0); @b = quantize(0) }',
+ 'tick-1000hz { @a = quantize(rand()); }',
+ 'tick-1000hz { @a = lquantize(0, 0, 100, 1); }',
+ 'tick-1000hz { @a = lquantize(0, 0, 100, 1); @b = lquantize(10, -10, 10); }',
+];
+
+var pad = function (val, len)
+{
+ var rval = '', i;
+ var str = val + '';
+
+ for (i = 0; i < len - str.length; i++)
+ rval += ' ';
+
+ rval += str;
+
+ return (rval);
+};
+
+var seconds = -1;
+var end = 30;
+var dtp = undefined;
+var dumped = -1;
+
+setInterval(function () {
+ if (!dtp) {
+ if (!tests.length)
+ process.exit(0);
+
+ test = tests.shift();
+ start = new Date().valueOf();
+
+ dtp = new libdtrace.Consumer();
+
+ sys.puts(seconds != -1 ? '\n' : '');
+ sys.puts('Testing heap consumption of:\n ' + test + '\n');
+ sys.puts(pad('SECONDS', 9) + pad('HEAP-USED', 20) +
+ pad('HEAP-TOTAL', 20));
+ dtp.strcompile(test);
+ dtp.setopt('aggrate', '5000hz');
+ dtp.go();
+ }
+
+ dtp.aggwalk(function (varid, key, val) {});
+
+ seconds = Math.floor((new Date().valueOf() - start) / 1000);
+
+ if (seconds != dumped && seconds % 5 == 0) {
+ dumped = seconds;
+ var usage = process.memoryUsage();
+
+ sys.puts(pad(seconds, 9) + pad(usage.heapUsed, 20) +
+ pad(usage.heapTotal, 20));
+ }
+
+ if (seconds >= end) {
+ delete dtp;
+ dtp = undefined;
+ }
+}, 10);
View
42 tests/test-lquantize.js
@@ -0,0 +1,42 @@
+var sys = require('sys');
+var libdtrace = require('libdtrace');
+var assert = require('assert');
+
+dtp = new libdtrace.Consumer();
+
+prog = 'BEGIN\n{\n';
+
+for (i = -5; i < 15; i++)
+ prog += '\t@ = lquantize(' + i + ', 0, 10, 2);\n';
+
+prog += '}\n';
+
+sys.puts(prog);
+
+dtp.strcompile(prog);
+
+dtp.go();
+
+dtp.aggwalk(function (varid, key, val) {
+ sys.puts(sys.inspect(val));
+});
+
+dtp = new libdtrace.Consumer();
+
+prog = 'BEGIN\n{\n';
+
+for (i = -100; i < 100; i++)
+ prog += '\t@ = lquantize(' + i + ', -200, 200, 10);\n';
+
+prog += '}\n';
+
+dtp.strcompile(prog);
+
+dtp.go();
+
+dtp.aggwalk(function (varid, key, val) {
+ sys.puts(sys.inspect(val));
+});
+
+delete dtp;
+
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