removed parallelism guard

compiler/deps.nim

@@ -995,34 +995,6 @@ proc generateBackendBuildFile(c: DepContext; forwardedArgs: seq[string]): string
 
   b.endTree()  # stmts
 
-proc backendParallelFlag(conf: ConfigRef): string =
-  ## The `--parallel` flag for the *backend* nifmake run. Unlike the frontend
-  ## (cheap `nim m` processes), every per-module backend process loads the whole
-  ## program (~1GB+), so an unbounded fan-out on a many-core box exhausts RAM.
-  ## Cap the job count: `-d:icBackendJobs:N` sets it explicitly, otherwise derive
-  ## it from available memory (Linux) and the core count with headroom. (nifmake
-  ## honours the count via `--parallel:N`; `countProcessors` ignores CPU affinity
-  ## so `taskset` cannot bound it.) `-d:icNoParallel` forces serial.
-  if isDefined(conf, "icNoParallel"): return ""
-  var jobs = 0
-  let ov = conf.symbols.getOrDefault("icBackendJobs")
-  if ov.len > 0:
-    try: jobs = max(1, parseInt(ov))
-    except ValueError: jobs = 0
-  if jobs == 0:
-    jobs = countProcessors()
-    if jobs <= 0: jobs = 1
-    when defined(linux):
-      try:
-        for line in lines("/proc/meminfo"):
-          if line.startsWith("MemAvailable:"):
-            let kb = parseInt(line.splitWhitespace()[1])
-            jobs = max(1, min(jobs, kb div (1536 * 1024))) # ~1.5 GB per process
-            break
-      except CatchableError:
-        discard
-  result = " --parallel:" & $jobs
-
 proc commandIc*(conf: ConfigRef) =
   ## Main entry point for `nim ic`
   when not defined(nimKochBootstrap):
@@ -1105,7 +1077,6 @@ proc commandIc*(conf: ConfigRef) =
     # with `-d:icNoParallel` (e.g. for readable, non-interleaved child output
     # when debugging a build).
     let parallel = if isDefined(conf, "icNoParallel"): "" else: " --parallel"
-    let backendParallel = backendParallelFlag(conf)
 
     # Phase 1 — frontend (nifler + `nim m`), run to a discovery fixpoint.
     var rounds = 0
@@ -1163,7 +1134,7 @@ proc commandIc*(conf: ConfigRef) =
     if frontendOk:
       let backendFile = generateBackendBuildFile(c, forwardedArgs)
       rawMessage(conf, hintSuccess, "generated: " & backendFile)
-      let cmd = quoteShell(nifmake) & " run" & backendParallel & " " & quoteShell(backendFile)
+      let cmd = quoteShell(nifmake) & " run" & parallel & " " & quoteShell(backendFile)
       rawMessage(conf, hintExecuting, cmd)
       let exitCode = execShellCmd(cmd)
       if exitCode != 0: