/**
 * @return the ratio a/b, pretty-printed as a percentage string
 *
 */
export declare function calcPercentage(a: number, b: number): string;
/**
 * @param sum cpu consumption in units of milliseconds
 *
 * @return the same figure, in units of fractional seconds
 *
 */
export declare function cpuPretty(sum: number): string;
/**
 * @param sum memory consumption, in units of bytes
 *
 * @return the same figure, pretty printed in a kb/MB/GB fashion
 *
 */
export declare function memPretty(sum: number): string;