use all available threads for analysis

lib/util.js

@@ -319,13 +319,15 @@ function getMemoryFlag() {
 }
 exports.getMemoryFlag = getMemoryFlag;
 /**
- * Get the codeql `--threads` value specified for the `threads` input. The value
- * defaults to 1. The value will be capped to the number of available CPUs.
+ * Get the codeql `--threads` value specified for the `threads` input.
+ * If not value was specified, all available threads will be used.
+ *
+ * The value will be capped to the number of available CPUs.
  *
  * @returns string
  */
 function getThreadsFlag() {
-    let numThreads = 1;
+    let numThreads;
     const numThreadsString = core.getInput("threads");
     if (numThreadsString) {
         numThreads = Number(numThreadsString);
@@ -334,13 +336,19 @@ function getThreadsFlag() {
         }
         const maxThreads = os.cpus().length;
         if (numThreads > maxThreads) {
+            core.info(`Clamping desired number of threads (${numThreads}) to max available (${maxThreads}).`);
             numThreads = maxThreads;
         }
         const minThreads = -maxThreads;
         if (numThreads < minThreads) {
+            core.info(`Clamping desired number of free threads (${numThreads}) to max available (${minThreads}).`);
             numThreads = minThreads;
         }
     }
+    else {
+        // Default to using all threads
+        numThreads = os.cpus().length;
+    }
     return `--threads=${numThreads}`;
 }
 exports.getThreadsFlag = getThreadsFlag;